Document:

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                            AGREEMENT FOR EMPLOYMENT
                          FOLLOWING A CHANGE OF CONTROL

                AGREEMENT by and between GATX Corporation, a New York
corporation (the "Company") and Robert C. Lyons (the "Executive") dated as of
the 30th day of September 2005.

                The Board of Directors of the Company (the "Board"), has
determined that it is in the best interests of the Company and its shareholders
to assure that the Company will have the continued dedication of the Executive,
notwithstanding the possibility, threat or occurrence of a Change of Control (as
defined below). The Board believes it is imperative to diminish the inevitable
distraction of the Executive by virtue of the personal uncertainties and risks
created by a pending or threatened Change of Control and to encourage the
Executive's full attention and dedication to the Company currently and in the
event of any threatened or pending Change of Control, and to provide the
Executive with compensation and benefits arrangements upon a Change of Control
which ensure that the compensation and benefits expectations of the Executive
will be satisfied and which are competitive with those of other corporations.
Therefore, in order to accomplish these objectives, the Board has caused the
Company to enter into this Agreement.

                NOW, THEREFORE, IT IS HEREBY AGREED AS FOLLOWS:

                1. Certain Definitions. (a) The "Effective Date" shall mean the
first date during the Change of Control Period (as defined in Section 1(b)) on
which a Change of Control (as defined in Section 2) occurs. Anything in this
Agreement to the contrary notwithstanding, if a Change of Control occurs, and if
the Executive's employment with the Company is terminated prior to the date on
which the Change of Control occurs, and if it is reasonably demonstrated by the
Executive that such termination of employment (i) was at the request of a third
party who has taken steps reasonably calculated to effect a Change of Control or
(ii) otherwise arose in connection with or anticipation of a Change of Control,
then for all purposes of this Agreement the "Effective Date" shall mean the date
immediately prior to the date of such termination of employment.

                (b) The "Change of Control Period" shall mean the period
commencing on January 1, 2005, and ending on the third anniversary of the date
thereof; provided, however, that commencing on January 1, 2006, and on each
annual anniversary of such date (such date and each annual anniversary thereof
shall be hereinafter referred to as the "Renewal Date"), unless previously
terminated, the Change of Control Period shall be automatically extended so as
to terminate three years from such Renewal Date, unless at least 60 days prior
to the Renewal Date the Company shall give notice to the Executive that the
Change of Control Period shall not be so extended.

                2. Change of Control. For the purpose of this Agreement, a
"Change of Control" shall mean:

                (a) The acquisition by any individual, entity or group (within
the meaning of Section 13(d)(3) or 14(d)(2) of the Securities Exchange Act of
1934, as amended (the "Exchange Act")) (a "Person") of beneficial ownership
(within the meaning of Rule 13d-3

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promulgated under the Exchange Act) of 20% or more of either (i) the then
outstanding shares of common stock of the Company (the "Outstanding Company
Common Stock") or (ii) the combined voting power of the then outstanding voting
securities of the Company entitled to vote generally in the election of
directors (the "Outstanding Company Voting Securities"); provided, however, that
for purposes of this subsection (a), the following acquisitions shall not
constitute a Change of Control: (1) any acquisition directly from the Company,
(2) any acquisition by the Company, (3) any acquisition by any employee benefit
plan (or related trust) sponsored or maintained by the Company or any
corporation controlled by the Company or (4) any acquisition by any corporation
pursuant to a transaction which complies with clauses (1), (2) and (3) of
subsection (c) of this Section 2; or

                (b) Individuals who, as of the date hereof, constitute the Board
(the "Incumbent Board") cease for any reason to constitute at least a majority
of the Board; provided, however, that any individual becoming a director
subsequent to the date hereof whose election, or nomination for election by the
Company's shareholders, was approved by a vote of at least a majority of the
directors then comprising the Incumbent Board shall be considered as though such
individual were a member of the Incumbent Board, but excluding, for this
purpose, any such individual whose initial assumption of office occurs as a
result of an actual or threatened election contest with respect to the election
or removal of directors or other actual or threatened solicitation of proxies or
consents by or on behalf of a Person other than the Board; or

                (c) Consummation of a reorganization, merger or consolidation or
sale or other disposition (including, without limitation, a disposition
occurring by merger, consolidation, sale, or other similar transactions of one
or more subsidiaries of the Company) of all or substantially all of the assets
of the Company (a "Business Combination"), in each case unless, following such
Business Combination (other than a Business Combination of the type referred to
in the first parenthetical of this subsection (c) which results in the
disposition of all or substantially all of the assets of the Company), (i) all
or substantially all of the individuals and entities who were the beneficial
owners, respectively, of the Outstanding Company Common Stock and Outstanding
Company Voting Securities immediately prior to such Business Combination
beneficially own, directly or indirectly, more than 65% of, respectively, the
then outstanding shares of common stock and the combined voting power of the
then outstanding voting securities entitled to vote generally in the election of
directors, as the case may be, of the corporation resulting from such Business
Combination (including, without limitation, a corporation which as a result of
such transaction owns the Company or all or substantially all of the Company's
assets either directly or through one or more subsidiaries) in substantially the
same proportions as their ownership, immediately prior to such Business
Combination of the Outstanding Company Common Stock and Outstanding Company
Voting Securities, as the case may be, (ii) no Person (excluding any corporation
resulting from such Business Combination or any employee benefit plan (or
related trust) of the Company or such corporation resulting from such Business
Combination) beneficially owns, directly or indirectly, 20% or more of,
respectively, the then outstanding shares of common stock of the corporation
resulting from such Business Combination or the combined voting power of the
then outstanding voting securities of such corporation except to the extent that
such ownership existed prior to

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the Business Combination and (iii) at least a majority of the members of the
board of directors of the corporation resulting from such Business Combination
were members of the Incumbent Board at the time of the execution of the initial
agreement, or of the action of the Board, providing for such Business
Combination; or

                (d) Approval by the shareholders of the Company of a complete
liquidation or dissolution of the Company; or

                (e) Consummation of a reorganization, merger or consolidation or
sale or other disposition of any subsidiary or of all or substantially all of
the assets of any subsidiary of the Company or a disposition (in a single
transaction or series of integrated transactions) of all or substantially all of
the assets of an operating segment of the Company as identified in the financial
statements included in the Company's most recent Annual Report on Form 10-K
(each a "Business Segment") that is, in either case, the primary employer of the
Executive or to which the Executive's responsibilities primarily relate
immediately prior thereto, and which does not constitute a Business Combination
as defined in Section 1(c), unless immediately thereafter the Company, either
directly or indirectly, owns (i) at least 50% of the voting stock of any such
subsidiary disposed of or, (ii) in the case of the disposition of all or
substantially all of the assets of a subsidiary or Business Segment, at least
50% of both the voting power over and the equity in any entity holding title to
such assets.

                3. Employment Period. The Company hereby agrees to continue the
Executive in its employ, and the Executive hereby agrees to remain in the employ
of the Company subject to the terms and conditions of this Agreement, for the
period commencing on the Effective Date and ending on the third anniversary of
such date (the "Employment Period").

                4. Terms of Employment. (a) Position and Duties. (i) During the
Employment Period, (A) the Executive's position (including status, offices,
titles and reporting requirements), authority, duties and responsibilities shall
be at least commensurate in all material respects with the most significant of
those held, exercised and assigned by or to the Executive at any time during the
120-day period immediately preceding the Effective Date and (B) the Executive's
services shall be performed at the location where the Executive was employed
immediately preceding the Effective Date or any office or location less than 35
miles from such location.

                         (ii) During the Employment Period, and excluding any
periods of vacation and sick leave to which the Executive is entitled, the
Executive agrees to devote reasonable attention and time during normal business
hours to the business and affairs of the Company and, to the extent necessary to
discharge the responsibilities assigned to the Executive hereunder, to use the
Executive's reasonable best efforts to perform faithfully and efficiently such
responsibilities. During the Employment Period it shall not be a violation of
this Agreement for the Executive to (A) serve on corporate, civic or charitable
boards or committees, (B) deliver lectures, fulfill speaking engagements or
teach at educational institutions and (C) manage personal investments, so long
as such activities do not significantly interfere with the performance of the
Executive's responsibilities as an employee of the Company in accordance with
this

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Agreement. It is expressly understood and agreed that to the extent that any
such activities have been conducted by the Executive prior to the Effective
Date, the continued conduct of such activities (or the conduct of activities
similar in nature and scope thereto) subsequent to the Effective Date shall not
thereafter be deemed to interfere with the performance of the Executive's
responsibilities to the Company.

                (b) Compensation. (i) Base Salary. During the Employment Period,
the Executive shall receive an annual base salary ("Annual Base Salary"), which
shall be paid at a monthly rate, at least equal to twelve times the highest
monthly base salary paid or payable, including any base salary which has been
earned but deferred, to the Executive by the Company and its affiliated
companies during the twelve-month period immediately preceding the month in
which the Effective Date occurs. During the Employment Period, the Annual Base
Salary shall be reviewed no more than 12 months after the last salary increase
awarded to the Executive prior to the Effective Date and thereafter at least
annually. Any increase in Annual Base Salary shall not serve to limit or reduce
any other obligation to the Executive under this Agreement. Annual Base Salary
shall not be reduced after any such increase and the term Annual Base Salary as
utilized in this Agreement shall refer to Annual Base Salary as so increased. As
used in this Agreement, the term "affiliated companies" shall include any
company controlled by, controlling or under common control with the Company.

                         (ii) Annual Bonus. In addition to Annual Base Salary,
the Executive shall be awarded, or each fiscal year ending during the Employment
Period, an annual bonus (the "Annual Bonus") in cash at least equal to the
highest bonus earned by the Executive for the last two full fiscal years prior
to the Effective Date (annualized in the event that the Executive was not
employed by the Company for the whole of such fiscal year). Each such Annual
Bonus shall be paid no later than the end of the third month of the fiscal year
next following the fiscal year for which the Annual Bonus is awarded, unless the
Executive shall elect to defer the receipt of such Annual Bonus.

                         (iii) Long-Term Incentive, Savings and Retirement
Plans. During the Employment Period, the Executive shall be entitled to
participate in all long-term incentive, stock option, savings and retirement
plans, practices, policies and programs applicable generally to other peer
executives of the Company and its affiliated companies, but in no event shall
such plans, practices, policies and programs provide the Executive with
long-term incentive opportunities (measured with respect to both regular and
special incentive opportunities, to the extent, if any, that such distinction is
applicable), stock option opportunities, savings opportunities and retirement
benefit opportunities, in each case, less favorable, in the aggregate, than the
most favorable of those provided by the Company and its affiliated companies for
the Executive under such plans, practices, policies and programs as in effect at
any time during the 120-day period immediately preceding the Effective Date or
if more favorable to the Executive, those provided generally at any time after
the Effective Date to other peer executives of the Company and its affiliated
companies.

                         (iv) Welfare Benefit Plans. During the Employment
Period, the Executive and/or the Executive's family, as the case may be, shall
be eligible for participation in and shall receive all benefits under welfare
benefit plans, practices,

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policies and programs provided by the Company and its affiliated companies
(including, without limitation, medical, prescription, dental, disability,
employee life, group life, accidental death and travel accident insurance plans
and programs) to the extent applicable generally to other peer executives of the
Company and its affiliated companies, but in no event shall such plans,
practices, policies and programs provide the Executive with benefits which are
less favorable, in the aggregate, than the most favorable of such plans,
practices, policies and programs in effect for the Executive at any time during
the 120-day period immediately preceding the Effective Date or, if more
favorable to the Executive, those provided generally at any time after the
Effective Date to other peer executives of the Company and its affiliated
companies.

                         (v) Expenses. During the Employment Period, the
Executive shall be entitled to receive prompt reimbursement for all reasonable
expenses incurred by the Executive in accordance with the most favorable
policies, practices and procedures of the Company and its affiliated companies
in effect for the Executive at any time during the 120-day period immediately
preceding the Effective Date or, if more favorable to the Executive, as in
effect generally at any time thereafter with respect to other peer executives of
the Company and its affiliated companies.

                         (vi) Fringe Benefits. During the Employment Period, the
Executive shall be entitled to fringe benefits, including, without limitation,
tax and financial planning services, payment of club dues, and, if applicable,
use of an automobile and payment of related expenses, or payment of an
automobile allowance in accordance with the most favorable plans, practices,
programs and policies of the Company and its affiliated companies in effect for
the Executive at any time during the 120-day period immediately preceding the
Effective Date or, if more favorable to the Executive, as in effect generally at
any time thereafter with respect to other peer executives of the Company and its
affiliated companies.

                         (vii) Office and Support Staff. During the Employment
Period, the Executive shall be entitled to an office or offices of a size and
with furnishings and other appointments, and to exclusive personal secretarial
and other assistance, at least equal to the most favorable of the foregoing
provided to the Executive by the Company and its affiliated companies at any
time during the 120-day period immediately preceding the Effective Date or, if
more favorable to the Executive, as provided generally at any time thereafter
with respect to other peer executives of the Company and its affiliated
companies.

                         (viii) Vacation. During the Employment Period, the
Executive shall be entitled to paid vacation in accordance with the most
favorable plans, policies, programs and practices of the Company and its
affiliated companies as in effect for the Executive at any time during the
120-day period immediately preceding the Effective Date or, if more favorable to
the Executive, as in effect generally at any time thereafter with respect to
other peer executives of the Company and its affiliated companies.

                5. Termination of Employment. (a) Death or Disability. The
Executive's employment shall terminate automatically upon the Executive's death
during the Employment Period. If Disability of the Executive has occurred during
the Employment

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Period (pursuant to the definition of Disability set forth below), the Company
may give to the Executive written notice in accordance with Section 12(b) of
this Agreement of its intention to terminate the Executive's employment no
sooner than 30 days following such notice. In such event, the Executive's
employment with the Company shall terminate effective on the date specified in
such notice (the "Disability Effective Date"), provided that the Executive shall
not have returned to full-time performance of the Executive's duties prior
thereto. For purposes of this Agreement, "Disability" shall mean any disability
that (a) entitles the Executive to disability income benefits under the GATX
Long Term Disability Income Plan as in effect on the day prior to the Effective
Date, and (b) prevents the executive, for the duration of the Employment Period,
from engaging in the same or comparable type of employment as that in which the
Executive was engaged on the day prior to the Effective Date.

                (b) Cause. The Company may terminate the Executive's employment
during the Employment Period only for Cause. For purposes of this Agreement,
"Cause" shall mean:

                (i) the willful and continued failure of the Executive to
        perform substantially the Executive's duties with the Company or one of
        its affiliates (other than any such failure resulting from incapacity
        due to physical or mental illness), after a written demand for
        substantial performance is delivered to the Executive by the Board or
        the Chief Executive Officer of the Company which specifically identifies
        the manner in which the Board or Chief Executive Officer believes that
        the Executive has not substantially performed the Executive's duties, or

                (ii) the willful engaging by the Executive in illegal conduct or
        gross misconduct which is materially and demonstrably injurious to the
        Company.

For purposes of this provision, no act or failure to act, on the part of the
Executive, shall be considered "willful" unless it is done, or omitted to be
done, by the Executive in bad faith or without reasonable belief that the
Executive's action or omission was in the best interests of the Company. Any
act, or failure to act, based upon authority given pursuant to a resolution duly
adopted by the Board or upon the instructions or concurrence of the Chief
Executive Officer or a senior officer of the Company or based upon the advice of
counsel for the Company shall be conclusively presumed to be done, or omitted to
be done, by the Executive in good faith and in the best interests of the
Company. The cessation of employment of the Executive shall not be deemed to be
for Cause unless and until there shall have been delivered to the Executive a
copy of a resolution duly adopted by the affirmative vote of not less than
three-quarters of the entire membership of the Board at a meeting of the Board
called and held for such purpose (after reasonable notice is provided to the
Executive and the Executive is given an opportunity, together with counsel, to
be heard before the Board), finding that, in the good faith opinion of the
Board, the Executive is guilty of the conduct described in subparagraph (i) or
(ii) above, and specifying the particulars thereof in detail.

                (c) Good Reason. The Executive's employment may be terminated by
the Executive for Good Reason. For purposes of this Agreement, "Good Reason"
shall mean:

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                (i) the assignment to the Executive of any duties inconsistent
        in any respect with the Executive's position (including status, offices,
        titles and reporting requirements), authority, duties or
        responsibilities as contemplated by Section 4(a) of this Agreement, or
        any other action by the Company which results in a diminution in such
        position, authority, duties or responsibilities, excluding for this
        purpose an isolated, insubstantial and inadvertent action not taken in
        bad faith and which is remedied by the Company promptly after receipt of
        notice thereof given by the Executive;

                (ii) any failure by the Company to comply with any of the
        provisions of Section 4(b) of this Agreement, other than an isolated,
        insubstantial and inadvertent failure not occurring in bad faith and
        which is remedied by the Company promptly after receipt of notice
        thereof given by the Executive;

                (iii) the Company's requiring the Executive to be based at any
        office or location other than as provided in Section 4(a)(i)(B) hereof
        or the Company's requiring the Executive to travel on Company business
        to a substantially greater extent than required immediately prior to the
        Effective Date;

                (iv) any purported termination by the Company of the Executive's
        employment otherwise than as expressly permitted by this Agreement; or

                (v) any failure by the Company to comply with and satisfy
        Section 11(c) of this Agreement.

For purposes of this Section 5(c), any good faith determination of "Good Reason"
made by the Executive shall be conclusive.

                (d) Notice of Termination. Any termination by the Company for
Cause, or by the Executive for Good Reason, shall be communicated by Notice of
Termination to the other party hereto given in accordance with Section 12(b) of
this Agreement. For purposes of this Agreement, a "Notice of Termination" means
a written notice which (i) indicates the specific termination provision in this
Agreement relied upon, (ii) to the extent applicable, sets forth in reasonable
detail the facts and circumstances claimed to provide a basis for termination of
the Executive's employment under the provision so indicated and (iii) if the
Date of Termination (as defined below) is other than the date of receipt of such
notice, specifies the termination date (which date shall be not more than thirty
days after the giving of such notice). The failure by the Executive or the
Company to set forth in the Notice of Termination any fact or circumstance which
contributes to a showing of Good Reason or Cause shall not waive any right of
the Executive or the Company, respectively, hereunder or preclude the Executive
or the Company, respectively, from asserting such fact or circumstance in
enforcing the Executive's or the Company's rights hereunder.

                (e) Date of Termination. "Date of Termination" means (i) if the
Executive's employment is terminated by the Company for Cause, or by the
Executive for Good Reason, the date of receipt of the Notice of Termination or
any later date specified

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therein, as the case may be, (ii) if the Executive's employment is terminated by
the Company other than for Cause or Disability, the Date of Termination shall be
the date on which the Company notifies the Executive of such termination and
(iii) if the Executive's employment is terminated by reason of death or
Disability, the Date of Termination shall be the date of death of the Executive
or the Disability Effective Date, as the case may be.

                6. Obligations of the Company upon Termination. (a) Good Reason;
Other Than for Cause, Death or Disability. If, during the Employment Period, the
Company shall terminate the Executive's employment other than for Cause, Death
or Disability or the Executive shall terminate employment for Good Reason:

                (i) The Company shall pay to the Executive in a lump sum in cash
        within 30 days after the Date of Termination (except in the event of an
        election made by the Executive pursuant to D below) the aggregate of the
        following amounts:

                         A. the sum of (1) the Executive's Annual Base Salary
                through the Date of Termination to the extent not theretofore
                paid, (2) the product of (x) the Executive's Annual Bonus as
                defined in Section 4(b)(ii) of the Agreement (annualized for any
                fiscal year consisting of less than twelve full months or during
                which the Executive was employed for less than twelve full
                months) and (y) a fraction, the numerator of which is the number
                of days in the current fiscal year through the Date of
                Termination, and the denominator of which is 365 and (3) any
                compensation previously deferred by the Executive (together with
                any accrued interest or earnings thereon) and any accrued
                vacation pay, in each case to the extent not theretofore paid
                (the sum of the amounts described in clauses (1), (2), and (3)
                shall be hereinafter referred to as the "Accrued Obligations");
                and

                         B. the amount equal to the product of (1) three and (2)
                the sum of (x) the Executive's Annual Base Salary and (y) the
                Executive's target bonus under the Company's Management
                Incentive Plan, or any comparable bonus plan in which the
                Executive participates and which has a target bonus generally
                similar to that in the Company's Management Incentive Plan (the
                "Target Bonus"), less amounts, if any, paid to the Executive in
                accordance with the Company's severance pay policies; and

                         C. an amount equal to the excess of (a) the actuarial
                equivalent of the benefit under the Company's qualified defined
                benefit retirement plan (the "Retirement Plan") and any excess
                or supplemental retirement plan in which the Executive
                participates (together, the "SERP") (utilizing in each case
                actuarial assumptions no less favorable to the Executive than
                those in effect under the Company's Retirement Plan immediately
                prior to the Effective Date), which the Executive would receive
                if the Executive's employment continued for three years after
                the Date of Termination assuming for this purpose that all
                accrued benefits are fully vested, and, assuming that the
                Executive's compensation in each of the three years is equal to
                the Annual Base Salary as required by Section 4(b)(i) and plus
                the

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                Executive's Target Bonus as described in Section 6(i)(B) for the
                most recent fiscal year (or other bonus amount considered
                pensionable under the Retirement Plan), over (b) the actuarial
                equivalent of the Executive's actual benefit (paid or payable),
                if any, under the Retirement Plan and the SERP as of the Date of
                Termination; and

                         D. should the Executive so elect by written notice
                provided to the Benefits Administrator no later than the
                business day immediately preceding the Effective Date, an amount
                equal to the present value of the benefits to which the
                Executive is entitled under the SERP as of the Date of
                Termination, utilizing (a) as a discount rate the rate of return
                on 10-year Treasury Securities in effect for the month prior to
                the month in which the change of control occurs, and (b)
                mortality assumptions based on the Applicable Mortality Tables
                defined in Section 417(e)(3)(A)(1) of the Code (as hereinafter
                defined); such amount shall be paid on the first anniversary of
                the Effective Date if the Executive's employment has been
                terminated as above provided prior thereto, otherwise it shall
                be paid on the Executive's Date of Termination.

                (ii) for three years after the Executive's Date of Termination,
        or such longer period as may be provided by the terms of the appropriate
        plan, program, practice or policy, the Company shall continue benefits
        to the Executive and/or the Executive's family at least equal to those
        which would have been provided to them in accordance with the plans,
        programs, practices and policies described in Section 4(b)(iv) of this
        Agreement if the Executive's employment had not been terminated or, if
        more favorable to the Executive, as in effect generally at any time
        thereafter with respect to other peer executives of the Company and its
        affiliated companies and their families (collectively, "Welfare
        Benefits"), provided, however, that if the Executive becomes reemployed
        with another employer and is eligible to receive medical or other
        welfare benefits under another employer provided plan, the medical and
        other welfare benefits described herein shall be secondary to those
        provided under such other plan during such applicable period of
        eligibility. For purposes of determining eligibility (but not the time
        of commencement of benefits) of the Executive for retiree benefits
        pursuant to such plans, practices, programs and policies, the Executive
        shall be considered to have remained employed until three years after
        the Date of Termination and to have retired on the last day of such
        period. The Company shall continue to provide the Executive with Welfare
        Benefits at the Executive's own cost until the Executive is eligible for
        coverage under Medicare;

                (iii) the Company shall, at a maximum cost of 10% of the
        Executive's Annual Base Salary, provide the Executive with outplacement
        services the scope and provider of which shall be selected by the
        Executive in his sole discretion; and

                (iv) to the extent not theretofore paid or provided, the Company
        shall timely pay or provide to the Executive any other amounts or
        benefits required to be paid or provided or which the Executive is
        eligible to receive under any plan, program, policy or practice or
        contract or agreement of the Company and its affiliated

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        companies (such other amounts and benefits shall be hereinafter
        referred to as the "Other Benefits").

                (b) Death. If the Executive's employment is terminated by reason
of the Executive's death during the Employment Period, this Agreement shall
terminate without further obligations to the Executive's legal representatives
under this Agreement, other than for payment of Accrued Obligations and the
timely payment or provision of Other Benefits. Accrued Obligations shall be paid
to the Executive's estate or beneficiary, as applicable, in a lump sum in cash
within 30 days of the Date of Termination. With respect to the provision of
Other Benefits, the term Other Benefits as utilized in this Section 6(b) shall
include, without limitation, and the Executive's estate and/or beneficiaries
shall be entitled to receive, benefits at least equal to the most favorable
benefits provided by the Company and affiliated companies to the estates and
beneficiaries of peer executives of the Company and such affiliated companies
under such plans, programs, practices and policies relating to death benefits,
if any, as in effect with respect to other peer executives and their
beneficiaries at any time during the 120-day period immediately preceding the
Effective Date or, if more favorable to the Executive's estate and/or the
Executive's beneficiaries, as in effect on the date of the Executive's death
with respect to other peer executives of the Company and its affiliated
companies and their beneficiaries.

                (c) Disability. If the Executive's employment is terminated by
reason of the Executive's Disability during the Employment Period, this
Agreement shall terminate without further obligations to the Executive, other
than for payment of Accrued Obligations and the timely payment or provision of
Other Benefits. Accrued Obligations shall be paid to the Executive in a lump sum
in cash within 30 days of the Date of Termination. With respect to the provision
of Other Benefits, the term Other Benefits as utilized in this Section 6(c)
shall include, and the Executive shall be entitled after the Disability
Effective Date to receive, disability and other benefits at least equal to the
most favorable of those generally provided by the Company and its affiliated
companies to disabled executives and/or their families in accordance with such
plans, programs, practices and policies relating to disability, if any, as in
effect generally with respect to other peer executives and their families at any
time during the 120-day period immediately preceding the Effective Date or, if
more favorable to the Executive and/or the Executive's family, as in effect at
any time thereafter generally with respect to other peer executives of the
Company and its affiliated companies and their families.

                (d) Cause; Other than for Good Reason. If the Executive's
employment shall be terminated for Cause during the Employment Period, this
Agreement shall terminate without further obligations to the Executive other
than the obligation to pay to the Executive (x) his Annual Base Salary through
the Date of Termination, (y) the amount of any compensation previously deferred
by the Executive, and (z) Other Benefits, in each case to the extent theretofore
unpaid. If the Executive voluntarily terminates employment during the Employment
Period, excluding a termination for Good Reason, this Agreement shall terminate
without further obligations to the Executive, other than for Accrued Obligations
and the timely payment or provision of Other Benefits. In such case, all Accrued
Obligations shall be paid to the Executive in a lump sum in cash within 30 days
of the Date of Termination.

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                7. Non-exclusivity of Rights. Nothing in this Agreement shall
prevent or limit the Executive's continuing or future participation in any plan,
program, policy or practice (other than those providing severance benefits)
provided by the Company or any of its affiliated companies and for which the
Executive may qualify, nor, subject to Section 12(f), shall anything herein
limit or otherwise affect such rights as the Executive may have under any
contract or agreement with the Company or any of its affiliated companies.
Amounts which are vested benefits or which the Executive is otherwise entitled
to receive under any plan, policy, practice or program of or any contract or
agreement with the Company or any of its affiliated companies at or subsequent
to the Date of Termination shall be payable in accordance with such plan,
policy, practice or program or contract or agreement except as explicitly
modified by this Agreement.

                8. Full Settlement. The Company's obligation to make the
payments provided for in this Agreement and otherwise to perform its obligations
hereunder shall not be affected by any set-off, counterclaim, recoupment,
defense or other claim, right or action which the Company may have against the
Executive or others. In no event shall the Executive be obligated to seek other
employment or take any other action by way of mitigation of the amounts payable
to the Executive under any of the provisions of this Agreement and such amounts
shall not be reduced whether or not the Executive obtains other employment. The
Company agrees to pay as incurred, to the full extent permitted by law, all
legal fees and expenses which the Executive may incur as a result of any contest
(regardless of the outcome thereof) by the Company, the Executive or others of
the validity or enforceability of, or liability under, any provision of this
Agreement or any guarantee of performance thereof (including as a result of any
contest by the Executive about the amount of any payment pursuant to this
Agreement), plus in each case interest on any delayed payment at the applicable
Federal rate provided for in Section 7872(f)(2)(A) of the Internal Revenue Code
of 1986, as amended (the "Code"). If however, following the conclusion of such
contest, the court before whom such contest was held determines that under the
circumstances it was unjust for the Company to have paid all or any part of the
legal fees and expenses of the Executive pursuant to the immediately preceding
sentence, the Executive shall repay any such payments to the Company in
accordance with the order of the court.

                9.  Certain Additional Payments by the Company.

                (a) Anything in this Agreement to the contrary notwithstanding
and except as set forth below, in the event it shall be determined that any
payment or distribution by the Company or its affiliates to or for the benefit
of the Executive (whether paid or payable or distributed or distributable
pursuant to the terms of this Agreement or otherwise, but determined without
regard to any additional payments required under this Section 9) (a "Payment")
would be subject to the excise tax imposed by Section 4999 of the Code or any
interest or penalties are incurred by the Executive with respect to such excise
tax (such excise tax, together with any such interest and penalties, are
hereinafter collectively referred to as the "Excise Tax"), then the Executive
shall be entitled to receive an additional payment (a "Gross-Up Payment") in an
amount such that after payment by the Executive of all taxes (including any
interest or penalties imposed with respect to such taxes), including, without
limitation, any income taxes (and any interest and penalties

                                       11
<PAGE>

imposed with respect thereto) and Excise Tax imposed upon the Gross-Up Payment,
the Executive retains an amount of the Gross-Up Payment equal to the Excise Tax
imposed upon the Payments. Notwithstanding the foregoing provisions of this
Section 9(a), if it shall be determined that the Executive is entitled to a
Gross-Up Payment, but that the Payments do not exceed 110% of the greatest
amount (the "Reduced Amount") that could be paid to the Executive such that the
receipt of Payments would not give rise to any Excise Tax, then no Gross-Up
Payment shall be made to the Executive and the Payments, in the aggregate, shall
be reduced to the Reduced Amount.

                (b) Subject to the provisions of Section 9(c), all
determinations required to be made under this Section 9, including whether and
when a Gross-Up Payment is required and the amount of such Gross-Up Payment and
the assumptions to be utilized in arriving at such determination, shall be made
by Ernst & Young LLP or such other certified public accounting firm as may be
designated by the Executive (the "Accounting Firm") which shall provide detailed
supporting calculations both to the Company and the Executive within 15 business
days of the receipt of notice from the Executive that there has been a Payment,
or such earlier time as is requested by the Company. In the event that the
Accounting Firm is serving as accountant or auditor for the individual, entity
or group effecting the Change of Control, the Executive shall appoint another
nationally recognized accounting firm to make the determinations required
hereunder (which accounting firm shall then be referred to as the Accounting
Firm hereunder). All fees and expenses of the Accounting Firm shall be borne
solely by the Company. Any Gross-Up Payment, as determined pursuant to this
Section 9, shall be paid by the Company to the Executive within five days of the
receipt of the Accounting Firm's determination. Any determination by the
Accounting Firm shall be binding upon the Company and the Executive. As a result
of the uncertainty in the application of Section 4999 of the Code at the time of
the initial determination by the Accounting Firm hereunder, it is possible that
Gross-Up Payments which will not have been made by the Company should have been
made ("Underpayment"), consistent with the calculations required to be made
hereunder. In the event that the Company exhausts its remedies pursuant to
Section 9(c) and the Executive thereafter is required to make a payment of any
Excise Tax, the Accounting Firm shall determine the amount of the Underpayment
that has occurred and any such Underpayment shall be promptly paid by the
Company to or for the benefit of the Executive.

                (c) The Executive shall notify the Company in writing of any
claim by the Internal Revenue Service that, if successful, would require the
payment by the Company of the Gross-Up Payment. Such notification shall be given
as soon as practicable but no later than ten business days after the Executive
is informed in writing of such claim and shall apprise the Company of the nature
of such claim and the date on which such claim is requested to be paid. The
Executive shall not pay such claim prior to the expiration of the 30-day period
following the date on which it gives such notice to the Company (or such shorter
period ending on the date that any payment of taxes with respect to such claim
is due). If the Company notifies the Executive in writing prior to the
expiration of such period that it desires to contest such claim, the Executive
shall:

                (i) give the Company any information reasonably requested by the
        Company relating to such claim,

                                       12

<PAGE>

                (ii) take such action in connection with contesting such claim
        as the Company shall reasonably request in writing from time to time,
        including, without limitation, accepting legal representation with
        respect to such claim by an attorney reasonably selected by the Company,

                (iii) cooperate with the Company in good faith in order
        effectively to contest such claim, and

                (iv) permit the Company to participate in any proceedings
        relating to such claim;

provided, however, that the Company shall bear and pay directly all costs and
expenses (including additional interest and penalties) incurred in connection
with such contest and shall indemnify and hold the Executive harmless, on an
after-tax basis, for any Excise Tax or income tax (including interest and
penalties with respect thereto) imposed as a result of such representation and
payment of costs and expenses. Without limitation on the foregoing provisions of
this Section 9(c), the Company shall control all proceedings taken in connection
with such contest and, at its sole option, may pursue or forgo any and all
administrative appeals, proceedings, hearings and conferences with the taxing
authority in respect of such claim and may, at its sole option, either direct
the Executive to pay the tax claimed and sue for a refund or contest the claim
in any permissible manner, and the Executive agrees to prosecute such contest to
a determination before any administrative tribunal, in a court of initial
jurisdiction and in one or more appellate courts, as the Company shall
determine; provided, however, that if the Company directs the Executive to pay
such claim and sue for a refund, the Company shall advance the amount of such
payment to the Executive, on an interest-free basis and shall indemnify and hold
the Executive harmless, on an after-tax basis, from any Excise Tax or income tax
(including interest or penalties with respect thereto) imposed with respect to
such advance or with respect to any imputed income with respect to such advance;
and further provided that any extension of the statute of limitations relating
to payment of taxes for the taxable year of the Executive with respect to which
such contested amount is claimed to be due is limited solely to such contested
amount. Furthermore, the Company's control of the contest shall be limited to
issues with respect to which a Gross-Up Payment would be payable hereunder and
the Executive shall be entitled to settle or contest, as the case may be, any
other issue raised by the Internal Revenue Service or any other taxing
authority.

                (d) If, after the receipt by the Executive of an amount advanced
by the Company pursuant to Section 9(c), the Executive becomes entitled to
receive any refund with respect to such claim, the Executive shall (subject to
the Company's complying with the requirements of Section 9(c)) promptly pay to
the Company the amount of such refund (together with any interest paid or
credited thereon after taxes applicable thereto). If, after the receipt by the
Executive of an amount advanced by the Company pursuant to Section 9(c), a
determination is made that the Executive shall not be entitled to any refund
with respect to such claim and the Company does not notify the Executive in
writing of its intent to contest such denial of refund prior to the expiration
of 30 days after such determination, then such advance shall be forgiven and
shall not be required to be

                                       13

<PAGE>

repaid and the amount of such advance shall offset, to the extent thereof, the
amount of Gross-Up Payment required to be paid.

                10. Confidential Information. The Executive shall hold in a
fiduciary capacity for the benefit of the Company all information, knowledge or
data relating to the Company or any of its affiliated companies, and their
respective businesses, which shall have been obtained by the Executive during
the Executive's employment by the Company or any of its affiliated companies and
which shall have been identified and held by the Company as proprietary and
confidential and which shall not be or become public knowledge (other than by
acts by the Executive or representatives of the Executive in violation of this
Agreement). After termination of the Executive's employment with the Company,
the Executive shall not, without the prior written consent of the Company or as
may otherwise be required by law or legal process, communicate or divulge any
such information, knowledge or data to anyone other than the Company and those
designated by it. In no event shall an asserted violation of the provisions of
this Section 10 constitute a basis for deferring or withholding any amounts
otherwise payable to the Executive under this Agreement.

                11.  Successors.  (a) This Agreement is personal to the
Executive and without the prior written consent of the Company shall not be
assignable by the Executive otherwise than by will or the laws of descent and
distribution. This Agreement shall inure to the benefit of and be enforceable by
the Executive's legal representatives.

                (b) This Agreement shall inure to the benefit of and be binding
upon the Company and its successors and assigns.

                (c) The Company will require any successor (whether direct or
indirect, by purchase, merger, consolidation or otherwise) to all or
substantially all of the business and/or assets of the Company to assume
expressly and agree to perform this Agreement in the same manner and to the same
extent that the Company would be required to perform it if no such succession
had taken place. The Company agrees that it will not effect the sale or other
disposition of all or substantially all of its assets unless either (1) the
person or entity acquiring the assets or a substantial portion of the assets
shall expressly assume by an instrument in writing all duties and obligations of
the Company under this Agreement or (2) the Company shall provide through the
establishment of a separate reserve for the payment in full of all amounts that
are or may be reasonably expected to become payable to the Executive under this
Agreement. As used in this Agreement, "Company" shall mean the Company as herein
before defined and any successor to its business and/or assets as aforesaid
which assumes and agrees to perform this Agreement by operation of law, or
otherwise.

                12. Miscellaneous. (a) This Agreement shall be governed by and
construed in accordance with the laws of the State of Illinois, without
reference to principles of conflict of laws. The captions of this Agreement are
not part of the provisions hereof and shall have no force or effect. This
Agreement may not be amended or modified otherwise than by a written agreement
executed by the parties hereto or their respective successors and legal
representatives.

                                       14

<PAGE>

                (b) All notices and other communications hereunder shall be in
writing and shall be given by hand delivery to the other party or by registered
or certified mail, return receipt requested, postage prepaid, addressed as
follows:

                If to the Executive:
                -------------------

                                           Robert C. Lyons
                                           193 Gage Street
                                           Riverside, IL  60546

                If to the Company:
                -----------------

                                           GATX CORPORATION
                                           500 West Monroe
                                           Chicago, IL  60661-3676

                                           Attention:  Senior Vice-President,
                                                       Human Resources

or to such other address as either party shall have furnished to the other in
writing in accordance herewith. Notice and communications shall be effective
when actually received by the addressee.

                (c) The invalidity or unenforceability of any provision of this
Agreement shall not affect the validity or enforceability of any other provision
of this Agreement.

                (d) The Company may withhold from any amounts payable under this
Agreement such Federal, state, local or foreign taxes as shall be required to be
withheld pursuant to any applicable law or regulation.

                (e) The Executive's or the Company's failure to insist upon
strict compliance with any provision of this Agreement or the failure to assert
any right the Executive or the Company may have hereunder, including, without
limitation, the right of the Executive to terminate employment for Good Reason
pursuant to Section 5(c)(i)-(v) of this Agreement, shall not be deemed to be a
waiver of such provision or right or any other provision or right of this
Agreement.

                (f) This Agreement supercedes and replaces the Agreement between
the Executive and the Company dated August 6, 2004.

                (g) The Executive and the Company acknowledge that, except as
may otherwise be provided under any other written agreement between the
Executive and the Company, the employment of the Executive by the Company is "at
will" and, subject

                                       15
<PAGE>
to Section 1(a) hereof, prior to the Effective Date, the Executive's employment
and/or this Agreement may be terminated by either the Executive or the Company
at any time prior to the Effective Date, in which case the Executive shall have
no further rights under this Agreement. From and after the Effective Date this
Agreement shall supersede any other agreement between the parties with respect
to the subject matter hereof.

                IN WITNESS WHEREOF, the Executive has hereunto set the
Executive's hand and, pursuant to the authorization from its Board of Directors,
the Company has caused these presents to be executed in its name on its behalf,
all as of the day and year first above written.

                                                     /s/ Robert C. Lyons
                                            ------------------------------------
                                                          Executive

                                            GATX CORPORATION

                                            By        /s/ Brian A. Kenney
                                              ----------------------------------
                                                   Its Chairman of the Board

                                                      October 18, 2005
                                            ------------------------------------
                                                       Execution Date

                                       16<PAGE>
                                                                               .
                                                                               .
                                                                               .
<Table>
<S><C>
                                                                                                                         EXHIBIT 4.3

                                                        CERTIFICATE OF STOCK

                              INCORPORATED UNDER THE LAWS                       COMMON STOCK
                              OF THE STATE OF DELAWARE                       PAR VALUE $.01 EACH

--------------------------
          NUMBER
                                                                                                            ------------------------
  C                                                       [IMAGE]                                                    SHARES

--------------------------
                                                                                                            ------------------------

                            THIS CERTIFICATE IS TRANSFERABLE IN             CUSIP 880349   10    5
                                  NEW YORK, NEW YORK AND          SEE REVERSE FOR CERT AIN RESTRICTIONS ON
                                CHARLOTTE, NORTH CAROLINA           PREEMPTIVE, TRANSFER AND OTHER RIGHTS

                                                            TENNECO INC.
                              ----------------------------------------------------------------------------
                                  This is to certify that

[TENNECO LOGO]

                                  is the owner of
                              ----------------------------------------------------------------------------
                                        FULLY PAID AND NON-ASSESSABLE SHARES OF THE COMMON STOCK OF

                     Tenneco Inc. transferable on the books of the Corporation by the holder hereof, in person or by duly authorized
                     attorney, upon surrender of this certificate properly endorsed.

                         This Certificate is not valid until countersigned by the Transfer Agent and registered by the Registrar.
                         Witness the facsimile seal of the Corporation and the facsimile signatures of its duly authorized officers.
[TENNECO SEAL]

                    /s/ MARK P. FRIMORA                                Dated:
                                                                       COUNTERSIGNED AND REGISTERED:
                                   CHAIRMAN OF THE BOARD,                             WACHOVIA BANK, N.A.
                    CHIEF EXECUTIVE OFFICER AND PRESIDENT                                                  TRANSFER AGENT
                                                                                                            AND REGISTRAR

                    /s/ K. A. STEWART                                  BY

                                      CORPORATE SECRETARY                                            AUTHORIZED SIGNATURE

</Table>
<PAGE>
<Table>
<S><C>
                                                            TENNECO INC.

     The following abbreviations, when used in the inscription on the face of this certificate, shall be construed as though they
were written out in full according to applicable laws or regulations:

     TEN COM - as tenants in common                                       UNIF GIFT MIN ACT - __________ Custodian ______________
     TEN ENT - as tenants by the entireties                                                      (Cust)                (Minor)
     JT TEN  - as joint tenants with right of                                                 under Uniform Gifts to Minors
               survivorship and not as tenants                                                Act ___________________
               in common                                                                                (State)

                              Additional abbreviations may also be used though not in the above list.

THE CORPORATION WILL FURNISH WITHOUT CHARGE TO EACH STOCKHOLDER WHO SO REQUESTS, THE DESIGNATIONS, POWERS, PREFERENCES AND RELATIVE,
PARTICIPATING, OPTIONAL OR OTHER SPECIAL RIGHTS OF EACH CLASS OF STOCK OR SERIES THEREOF OF THE CORPORATION, AND THE QUALIFICATIONS,
LIMITATIONS OR RESTRICTIONS OF SUCH PREFERENCES AND/OR RIGHTS. SUCH REQUEST MAY BE MADE TO THE CORPORATION OR THE TRANSFER AGENT.

NOTICE: THE SIGNATURE TO THIS ASSIGNMENT MUST CORRESPOND WITH THE NAME AS WRITTEN UPON THE FACE OF THIS CERTIFICATE, IN EVERY
PARTICULAR, WITHOUT ALTERATION OR ENLARGEMENT, OR ANY CHANGE WHATEVER.

For value received, __________________ hereby sell, assign and transfer unto

PLEASE INSERT SOCIAL SECURITY OR OTHER
IDENTIFYING NUMBER OF ASSIGNEE
--------------------------------------

--------------------------------------

------------------------------------------------------------------------------------------------------------------------------------
                          PLEASE PRINT OR TYPEWRITE NAME AND ADDRESS INCLUDING POSTAL ZIP CODE OF ASSIGNED

------------------------------------------------------------------------------------------------------------------------------------

------------------------------------------------------------------------------------------------------------------------------------

                                                                                                                             Shares
-----------------------------------------------------------------------------------------------------------------------------

of the capital stock represented by the within certificate, and do hereby irrevocably constitute and appoint
                                                                                                            ------------------------

------------------------------------------------------------------------------------------------------------------------------------

Attorney to transfer the said stock on the books of the within-named Corporation with full power of substitution in the premises.

Dated
      -------------------------------

                                      -------------------------------------------------------

     This certificate also evidences and entitles the holder hereof to certain rights as set forth in a Rights Agreement between
Tenneco Inc.,formerly known as Tenneco Automotive Inc. (the "Company"), and Wachovia Bank, N.A., as Rights Agent (as successor to
First Chicago Trust Company of New York), dated as of September 9, 1998 and as amended from time to time (the "Rights Agreement"),
the terms of which are hereby incorporated herein by reference and a copy of which is on file at the principal executive offices of
the Company. Under certain circumstances, as set forth in the Rights Agreement, such Rights will be evidenced by separate
certificates and will no longer be evidenced by this certificate. The Company will mail to the holder of this certificate a copy of
the Rights Agreement without charge after receipt of a written request therefor. Under certain circumstances, as set forth in the
Rights Agreement, Rights owned by or transferred to any Person who is or becomes an Acquiring Person (as defined in the Rights
Agreement) and certain transferees thereof will become null and void and will no longer be transferable.

</Table>

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