Document:

<PAGE>
                                                                  EXHIBIT 10.7.1

                             AMENDMENT NO. 1 TO THE
                            TRINITY INDUSTRIES, INC.
                           SUPPLEMENTAL PROFIT SHARING
                         AND DEFERRED DIRECTOR FEE TRUST

         THIS AGREEMENT is made as of this 27th day of December, 2000 by and
between TRINITY INDUSTRIES, INC., a Delaware corporation, (the "Company"), and
THE CHASE MANHATTAN BANK, N.A., a Delaware corporation (the "Trustee");

         WHEREAS, the Company and the Trustee previously executed THE TRINITY
INDUSTRIES, INC. SUPPLEMENTAL PROFIT SHARING AND DEFERRED DIRECTOR FEE TRUST
(the "Trust") effective April 1, 1999; and

         WHEREAS, the Company desires to amend the Trust to permit the Company
to set aside assets to find certain additional plans under the Trust; and

         WHEREAS, the Company and the Trustee desire to amend the Trust pursuant
to the authority reserved in Section 13;

         NOW, THEREFORE, the sections of the Trust set forth below are amended
as follows, but all other sections of the Trust shall remain in full force and
effect.

         1. Section 1(e) is hereby amended by adding the following paragraph to
the end thereof:

         "The Company and/or the Employers, in their sole discretion, also may
         at any time, or from time to time, make additional deposits of cash or
         other property in trust with the Trustee to augment the principal to be
         held, administered and disposed of by the Trustee for purposes of
         funding the benefits to certain employees pursuant to the Additional
         Plans. Notwithstanding the preceding paragraph, neither the Company nor
         the Employers shall be required to make any contributions with respect
         to the Additional Plans."

         2. Section 2(a) is hereby amended by revising the last sentence to be
and read as follows:

         "The Trustee shall make provision for the withholding of any federal,
         state or local taxes that may be required to be withheld with respect
         to the payment of benefits pursuant to the terms of the Additional Plan
         and shall pay amounts withheld to the Company or an employer who shall
         determine that such amounts have been reported to the taxing
         authorities as applicable."

         3. Section 2(a) is hereby further amended by adding the following
paragraph to the end thereof:

                                       1
<PAGE>

         "In the event that the Company or an Employer elects to make
         contributions to the Trust with respect to one or more of the
         Additional Plans, the Committee of each Additional Plan (or, if no
         Committee is designated, the Company) shall deliver to the Trustee a
         payment schedule that indicates the amounts payable in respect of each
         Additional Plan participant (and his or her beneficiaries), that
         provides a formula or other instructions acceptable to the Trustee for
         determining the amounts so payable, the form in which such amount is to
         be paid (as provided for or available under the Additional Plan), and
         the time of commencement for payment of such amounts. Except as
         otherwise provided herein, the Trustee shall make payments to the
         participants in an Additional Plan and their beneficiaries in
         accordance with such payment schedule. The Trustee shall make provision
         for the withholding of any federal, state or local taxes that may be
         required to be withheld with respect to the payment of benefits
         pursuant to the terms of the Additional Plan and shall pay amounts
         withheld to the Company or an Employer who shall determine that such
         amounts have been reported to the taxing authorities as applicable."

         4. Section 2(c) is hereby amended by adding the following paragraph to
the end thereof:

         "The Company or an Employer may make payment of benefits directly to
         the participants in an Additional Plan or their beneficiaries as they
         become due under the terms of such Additional Plan. The Company or an
         Employer, as applicable, shall notify the Trustee of its decision to
         make payment of benefits directly prior to the time amount are payable
         to such participants or their beneficiaries. In addition, if the
         principal of the Trust, and any earnings thereon, are not sufficient to
         make payments of benefits in accordance with the terms of an Additional
         Plan, the Company or an Employer, as applicable, shall make the balance
         of each such payment as it falls due. The Trustee shall notify the
         Company where principal and earnings are not sufficient to satisfy all
         payments due."

         5. Section 14(d)(iii) is hereby amended in its entirety to read as
follows:

         "(iii) "Participant" shall mean each "Participant" as that term is
         defined in the Supplemental Profit Sharing Plan and each Director who
         has an amount credited to his or her Account under the Director Plan or
         who has elected to have all or any portion of his or her Annual Fee
         deferred under the terms of that Plan. Notwithstanding the preceding,
         the term "Participant" also shall include any person who is a
         participant in an Additional Plan, but only to the extent that the
         Company has elected to make contributions to this Trust with respect to
         such Additional Plan."

         6. Section 14(d) is hereby further amended by adding the following new
Subsection 14(d)(iv) to the end thereof:

         "(iv) "Additional Plan" shall mean, collectively, (a) the Trinity
         Industries, Inc. Supplemental Retirement Plan; (b) the Trinity
         Industries, Inc. Directors' Retirement Plan; (c) the individual Change
         in Control Agreements between Trinity Industries, Inc. and the
         executives listed on the attached Exhibit A; and (d) the individual
         Deferred

                                       2
<PAGE>

         Compensation Plan and Agreements between Trinity Industries, Inc. and
         the executives listed on the attached Exhibit B, but only to the extent
         that the Company or an Employer has elected to make contributions with
         respect to such plan or agreement."

         7. Section 14(d) is hereby further amended by adding the following new
Subsection 14(d)(v) to the end thereof:

         "(iv) "Plan" shall mean (a) the Trinity Industries, Inc. Supplemental
         Profit Sharing Plan; (b) the Trinity Industries, Inc. Deferred Plan for
         Director Fees; and (c) the Additional Plans, each of which is sometimes
         referred to herein as a "Plan" and collectively referred to herein as
         the "Plans"."

         IN WITNESS WHEREOF, the Company and the Trustee have caused this
Amendment to be executed and their respective corporate seals to be affixed and
attested by their respective corporate officers on the day and year first
written above.

                                           TRINITY INDUSTRIES, INC.

                                           By: /s/ ML Lintner
                                               ---------------------------------

                                           Its: Vice President
                                               ---------------------------------

ATTEST:

/s/ Neil O. Shoop
------------------------
Its: Assistant Secretary
     -------------------

                                           CHASE MANHATTAN BANK, N.A.

                                           By: /s/ Karen Epps
                                               ---------------------------------

                                           Its: Vice President and Trust Officer
                                               ---------------------------------

ATTEST:

/s/ [Illegible]
------------------------

Its:
    --------------------

                                       3<PAGE>
                                                                    EXHIBIT 10.8

                            TRINITY INDUSTRIES, INC.
                          SUPPLEMENTAL RETIREMENT PLAN

                                    ARTICLE I
                                  INTRODUCTION

1.1  This Plan shall be known as the Trinity Industries, Inc. Supplemental
     Retirement Plan and shall be effective April 1, 1995.

1.2  This Plan is an unfunded deferred compensation arrangement for a select
     group of management or highly compensated personnel of Trinity Industries,
     Inc. and its Affiliates (as hereinafter defined) in order to supplement
     their retirement benefits to the extent that those benefits are limited by
     Sections 401(a)(17) and 415 of the Internal Revenue Code of 1986.
     Participants will be determined by the Plan Committee.

1.3  The payments made under this Plan shall be made in coordination with any
     benefits to which a Participant is or may become entitled under any Base
     Plan (as hereinafter defined).

1.4  Trinity Industries, Inc. hopes and expects to continue the Plan
     indefinitely, but reserves the right to amend it or terminate it in any
     respect and at any time or from time to time, to the extent provided in
     Article VI hereof.

1.5  This Plan shall apply only to an employee who begins receiving benefits
     from a Base Plan after April 1, 1995, as determined by the Plan Committee.

                                   ARTICLE II

                          DEFINITIONS AND CONSTRUCTION

2.1  Unless the context otherwise requires, the terms used herein shall have the
     meanings set forth in the remaining sections of this Article II.

                                       -1-

<PAGE>

2.2  Affiliate shall mean any entity affiliated with Trinity which shall have
     adopted a Base Plan for the benefit of its employees.

2.3  Base Plan shall mean the defined benefit plan or plans sponsored by Trinity
     and/or its Affiliates and qualified under Section 401(a) of the Code, from
     which the Participant is entitled to receive benefits.

2.4  Beneficiary shall mean the individual or individuals entitled to receive
     benefits payable on behalf of any Participant under his Base Plan in the
     event of his death on or after Retirement.

2.5  Board shall mean the Board of Directors of Trinity Industries, Inc.

2.6  Code shall mean the Internal Revenue Code of 1986, as amended from time to
     time.

2.7  Committee shall mean the Supplemental Retirement Plan Committee appointed
     by the Board.

2.8  Company shall mean Trinity Industries, Inc., a Delaware corporation, as
     well as its Affiliates, which are hereinafter collectively referred to as
     the Company.

2.9  Effective Date shall mean April 1, 1995.

2.10 Eligibility Requirements shall mean:

     (i)   having been employed by the Company for at least five (5) years;

     (ii)  receiving compensation from the Company in excess of the Code Section
           401(a)(17) limit (currently $150,000);

     (iii) being a participant under a Base Plan; and,

     (iv)  being included within a group of managerial or highly compensated
           employees of the Company selected by the Plan committee.

2.11 Employee shall mean any person employed by the Company who is included on
     the Federal Insurance Contribution Act rolls of the Company.

2.12 Participant shall mean an Employee who meets the Eligibility Requirements
     as determined by the Plan Committee.

                                       -2-

<PAGE>

2.13 Plan shall mean the Trinity Industries, Inc. Supplemental Retirement Plan
     as set forth in this document, as this document may be amended from time to
     time.

2.14 Retirement shall mean the date on which a Participant is eligible to begin
     receiving benefits from any Base Plan.

2.15 Trinity shall mean Trinity Industries, Inc., a Delaware corporation.

2.16 Masculine pronouns used herein shall refer to men or women or both and
     nouns and pronouns when stated in the singular shall include the plural and
     when stated in the plural shall include the singular, wherever appropriate.

                                   ARTICLE III

                           DESIGNATION OF PARTICIPANTS
                            AND FUNDING ARRANGEMENTS

3.1  The Committee shall meet as necessary to verify the eligibility of
     Participants and to approve the amounts of benefits.

3.2  Contributions by Trinity to pay benefits under the Plan will be made solely
     out of the general assets of Trinity. Nothing contained in this Plan and no
     action taken pursuant to the provisions of this Plan shall create or be
     construed to create a trust of any kind, or a fiduciary relationship
     between Trinity or the Plan and any Employee or any other person. Any funds
     which may be set aside or invested relative to the Plan shall continue for
     all purposes to be a part of the general funds of Trinity and no person
     other than Trinity shall, by virtue of the provisions of this Plan, have
     any interest in such funds. To the extent that any person acquires a right
     to receive payment from Trinity under the Plan, such right shall be no
     greater than the right of any unsecured general creditor of Trinity.

                                   ARTICLE IV

                                  PLAN BENEFITS

4.1  This Plan does not provide for the payment of compensation regularly
     payable to an Employee for his customary services to the Company.

                                       -3-

<PAGE>

4.2  Benefits payable under this Plan will be paid in coordination with any
     benefits payable to a Participant from his Base Plan.

4.3  If a Participant's services with the Company are terminated prior to his
     eligibility to receive early, normal or late Retirement benefits under his
     Base Plan, he shall forfeit all right, for himself and his Beneficiary, to
     any benefits under this Plan; provided, however, that in the event that
     such services are terminated for any reason other than death or disability
     after the occurrence of a "Change in Control" (as hereinafter defined),
     then such Participant shall not forfeit his right to benefits hereunder and
     shall be entitled to the difference between (i) his "accrued benefit" as
     determined under his Base Plan as of the date of such termination by not
     taking into account Sections 401(a)(17) and 415 of the Code and (ii) his
     "accrued benefit" determined under such Base Plan as of the date of such
     termination by taking into account Sections 401(a)(17) and 415 of the Code,
     with such amount payable to such Employee at the same time and in the same
     manner as Retirement benefits are payable under the Base Plan. For purposes
     of this Plan, a "Change in Control" shall occur in the case of acquisition
     of 50% or more of the outstanding common stock of the Company by a
     corporation, person or other entity pursuant to a tender offer or exchange
     offer for the common stock other than by the Company.

4.4  Benefits from the Plan shall be actuarially computed amounts payable to a
     Participant or Beneficiary so that the annual payments such Participant or
     Beneficiary shall receive from this Plan (as limited by the final sentence
     of this Section) and from the Base Plan shall equal the amount of the
     payments which the Participant would have received at Retirement under the
     Base Plan but for the operation of Section 401(a)(17) or Section 415 of the
     Code. The Plan shall not compensate any Participant or Beneficiary for any
     adverse effects to the Participant which result in a reduction of benefits
     available from the Base Plan due to changes in the Base Plan benefit
     formula, social security laws or other laws and rules.

4.5  In the event of a Participant's death on or after Retirement, Trinity shall
     make any payments called for hereunder to his Beneficiary. Any payment made
     by Trinity in good faith shall fully discharge Trinity from its obligations
     with respect to such payment, and

                                       -4-

<PAGE>

     Trinity shall have no further obligation to see to the application of any
     money so paid.

4.6  The benefits payable under this Plan to a Participant who is eligible to
     receive benefits from his Base Plan shall be made according to the form of
     payment elected or mandated under the Base Plan and shall commence at the
     same time as such Base Plan benefits.

                                    ARTICLE V

                                 ADMINISTRATION

5.1  The Committee shall have full power and authority to interpret, construe
     and administer the Plan. The Committee's interpretation and construction
     hereof, and actions hereunder, including any determination of the amount or
     recipient of any payment to be made under the Plan, shall be binding and
     conclusive on all persons and for all purposes. No member of the Committee
     or the Board shall be liable to any person for any action taken or omitted
     in connection with the interpretation and administration Of the Plan.

                                   ARTICLE VI

                            AMENDMENT AND TERMINATION

6.1  The Plan may be amended or terminated in whole or in part from time to time
     by the Board; provided, however, that no such action shall adversely affect
     Participants who shall have begun receiving benefits from the Plan;
     provided further that, in the event of a Change in Control (as defined in
     Section 4.3 hereof), the Plan may be so amended or terminated only upon
     approval (determined as of the date of such approval) by a majority in
     interest of all Participants entitled to benefits under the Plan.

6.2  If Trinity should reorganize, consolidate or merge with another
     corporation, the Plan shall become an obligation of the new entity or of
     any business taking over the assets, duties or responsibilities of Trinity.

6.3  If Trinity liquidates due to insolvency or any other event, the Plan shall
     terminate and be considered as fully and completely discharged.

                                       -5-

<PAGE>

                                   ARTICLE VII

                               GENERAL PROVISIONS

7.1  The Plan shall not be deemed to constitute a contract between the Company
     and any Employee or to be a consideration for, or an inducement for, the
     employment of any Employees by the Company. Nothing contained in the Plan
     shall be deemed to give any Employee the right to be retained in the
     service of the Company or to interfere with the right of the Company to
     discharge any Employee at any time, without regard to the effect such
     discharge may have on any rights under the Plan.

7.2  The Plan shall inure to the benefit of and be binding upon the Company, and
     the Participants and their successors and assigns.

7.3  No benefit payable under the Plan will be subject in any manner to
     anticipation, assignment, garnishment or pledge; and any attempt to
     anticipate, assign, garnish or pledge the same will be void; and no such
     benefits will be in any manner liable for or subject to the debts,
     liabilities, engagements or torts of the Participant; and if the
     Participant is adjudicated bankrupt or attempts to anticipate, assign or
     pledge any benefits, then such benefits will, in the discretion of the
     Committee, cease, and in that even the Committee will have the authority to
     cause the same or any part thereof to be held or applied to or for the
     benefit of the Participant, his Beneficiary, his children or other
     dependents, or any of them, in such manner and in such proportion as the
     Committee may deem proper. The foregoing will not, however, preclude or
     affect any pledges, liabilities or other obligations of the Participant to
     the Company.

7.4  If the Committee shall find that any person to whom any payment is payable
     under the Plan is unable to care for his affairs because of mental or
     physical illness, accident, or death, or is a minor, any payment due
     (unless a prior claim therefor shall have been made by a duly appointed
     guardian, committee or other legal representative) may be paid to the
     spouse, a child, a parent, a brother or sister or any person deemed by the
     Committee, in its sole discretion, to have incurred expenses for such
     person otherwise entitled to payment, in such manner and proportions as the
     Committee may determine. Any such payment shall be a complete discharge of
     the liabilities of Trinity under the Plan,

                                       -6-

<PAGE>

     and Trinity shall have no further obligation to see to the application of
     any money so paid.

7.5  The payment of Plan benefits to a Participant, as hereinabove provided,
     shall be subject to the following condition, the breach of which shall
     cause the Participant to forfeit all rights in and to any such benefits
     remaining unpaid on the date of such breach:

     Until all payments hereunder have been made in full, such Participant shall
     not, directly or indirectly, become or serve as an officer, employee, owner
     or partner of any business which, in the opinion of the Plan Committee,
     competes in a material manner with the Company, without the prior written
     consent of the Company.

7.6  The provisions of the Plan shall be construed according to the laws of the
     State of Texas.

   EXECUTED this 1st day of April, 1995.

                                           TRINITY INDUSTRIES, INC.

                                           By: /s/ JACK CUNNINGHAM
                                              ----------------------------------
                                           Title: Vice President
                                                 -------------------------------

Attest:

 /s/ NEIL O. SHOOP
---------------------------------

                                       -7-

<PAGE>

                            TRINITY INDUSTRIES, INC.
                          SUPPLEMENTAL RETIREMENT PLAN

                                AMENDMENT NO. 1

WHEREAS, the Board of Directors wishes to amend the Trinity Industries, Inc.
Supplement Retirement Plan to include "earned and ultimately paid" incentive
compensation rather than "paid" incentive compensation.

NOW, THEREFORE, the annual "Compensation" used when computing any benefit
payable under this plan will include incentive compensation earned under the
Company's Incentive Compensation Agreement, "when earned" rather than "when
paid". To be included as "Compensation" the incentive compensation, must
ultimately be paid.

IN WITNESS HEREOF, the Company has executed this Amendment on this 14th day of
September, 1995, effective as of September 14, 1995.

TRINITY INDUSTRIES, INC.

By: /s/ JACK CUNNINGHAM
   --------------------------------------
   Jack Cunningham
   Vice President

<PAGE>

                          SUPPLEMENTAL RETIREMENT PLAN
                                 AMENDMENT NO. 2

         The Trinity Industries, Inc. Supplemental Retirement Plan, as amended
from time to time (the "Plan"), is hereby further amended, effective as of May
6, 1997, as set forth below.

         Any term which is not defined below shall have the meaning set forth
for such term in the Plan.

         1. Section 4.2 of the Plan is hereby amended and restated as follows:

    4.2  Except as provided in Section 4.3 hereof, benefits payable under this
         Plan will be paid in coordination with any benefits payable to a
         Participant from his Base Plan.

         2. Section 4.3 of the Plan is hereby amended and restated as follows:

    4.3  If a Participant's services with the Company are terminated prior to
         his eligibility to receive early, normal or late Retirement benefits
         under his Base Plan, he shall forfeit all right, for himself and his
         Beneficiary, to any benefits under this Plan; provided, however, that
         in the event that such services are terminated for any reason (other
         than death or disability) after the occurrence of a "Change in Control"
         (as hereinafter defined), then such Participant shall not forfeit his
         right to benefits hereunder and shall be entitled to the difference
         between (i) his "accrued benefit" as determined under his Base Plan as
         of the date of such termination by not taking into account Sections
         401(a)(17) and 415 of the Code and (ii) his "accrued benefit"
         determined under

<PAGE>

         such Base Plan as of the date of such termination by taking into
         account Sections 401(a)(17) and 415 of the Code, with the actuarial
         value of such difference being payable to the Employee in a lump sum
         cash payment within five days following such termination.

         For purposes of this Plan, a "Change in Control" shall be deemed to
         have occurred if the event set forth in any one of the following
         paragraphs shall have occurred:

                   (I) any Person is or becomes the Beneficial Owner, directly
         or indirectly, of securities of Trinity Industries, Inc. ("Trinity")
         (not including in the securities beneficially owned by such Person any
         securities acquired directly from Trinity or its affiliates)
         representing 30% or more of the combined voting power of Trinity's then
         outstanding securities, excluding any Person who becomes such a
         Beneficial Owner in connection with a transaction described in clause
         (i) of paragraph (III) below; or

                   (II) the following individuals cease for any reason to
         constitute a majority of the number of directors then serving:
         individuals who, on May 6, 1997, constitute the Board and any new
         director (other than a director whose initial assumption of office is
         in connection with an actual or threatened election contest, including
         but not limited to a consent solicitation, relating to the election of
         directors of Trinity) whose appointment or election by the Board or
         nomination for election by Trinity's stockholders was approved or
         recommended by a vote of at

                                        2

<PAGE>

         least two-thirds (2/3) of the directors then still in office who either
         were directors on May 6, 1997, or whose appointment, election or
         nomination for election was previously so approved or recommended; or

                 (III) there is consummated a merger or consolidation of Trinity
         or any direct or indirect subsidiary of Trinity with any other
         corporation, other than (i) a merger or consolidation which would
         result in the voting securities of Trinity outstanding immediately
         prior to such merger or consolidation continuing to represent (either
         by remaining outstanding or by being converted into voting securities
         of the surviving entity or any parent thereof) at least 60% of the
         combined voting power of the securities of Trinity or such surviving
         entity or any parent thereof outstanding immediately after such merger.
         or consolidation, or (ii) a merger or consolidation effected to
         implement a recapitalization of Trinity (or similar transaction) in
         which no Person is or becomes the Beneficial Owner, directly or
         indirectly, of securities of Trinity (not including in the securities
         Beneficially Owned by such Person any securities acquired directly from
         Trinity or its Affiliates other than in connection with the acquisition
         by the Company or its affiliates of a business) representing 30% or
         more of the combined voting power of Trinity's then outstanding
         securities; or

                   (IV) the stockholders of Trinity approve a plan of complete
         liquidation or dissolution of Trinity or there is consummated an
         agreement for the sale or disposition by Trinity of all or

                                        3

<PAGE>

         substantially all of Trinity's assets, other than a sale or disposition
         by Trinity of all or substantially all of Trinity's assets to an
         entity, at least 60% of the combined voting power of the voting
         securities of which are owned by stockholders of Trinity in
         substantially the same proportions as their ownership of Trinity
         immediately prior to such sale.

         For purposes hereof:

         "Affiliate" shall have the meaning set forth in Rule 12b-2 promulgated
         under Section 12 of the Exchange Act.

         "Beneficial Owner" shall have the meaning set forth in Rule 13d-3 under
         the Exchange Act.

         "Exchange Act" shall mean the Securities Exchange Act of 1934, as
         amended from time to time.

         "Person" shall have the meaning given in Section 3(a)(9) of the
         Exchange Act, as modified and used in Sections 13(d) and 14(d) thereof,
         except that such term shall not include (i) Trinity or any of its
         subsidiaries, (ii) a trustee or other fiduciary holding securities
         under an employee benefit plan of Trinity or any of its Affiliates,
         (iii) an underwriter temporarily holding securities pursuant to an
         offering of such securities or (iv) a corporation owned, directly or
         indirectly, by the stockholders of Trinity in substantially the same
         proportions as their ownership of stock of Trinity.

         3. Section 4.6 of the Plan is hereby amended and restated as follows:

                                        4

<PAGE>

         4.6  Except as provided in Section 4.3 hereof, the benefits payable
              under this Plan to a Participant who is eligible to receive
              benefits from his Base Plan shall be made according to the form of
              payment elected or mandated under the Base Plan and shall commence
              at the same time as such Base Plan benefits.

         4.   Section 6.1 of the Plan is hereby amended and restated as follows:

         6.   The Plan may be amended or terminated in whole or in part from
              time to time by the Board; provided, however, that no such action
              shall adversely affect Participants who shall have begun receiving
              benefits from the Plan; and provided further, that during (a) the
              period commencing on the date of occurrence of a Potential Change
              in Control (as defined below) and ending on the earlier of (i) six
              months after the later of (1) the expiration of six months
              following the occurrence of such Potential Change in Control or
              (2) the Board's adoption of a resolution certifying that a
              Potential Change in control ceases to exist or (ii) the date of
              occurrence of a Change in Control, and (b) a period of two years
              following the occurrence of a Change in Control, the Plan may not
              be terminated or amended in any manner adverse to Participants or
              Beneficiaries (including, but not limited to, any adverse
              amendment of this Section 6.1 or any adverse amendment to the
              proviso in Section 4.3 hereof).

              For purposes of this Plan:

              A "Potential Change in Control" shall be deemed to have occurred
              if the event set

                                        5

<PAGE>

         forth in any one of the following paragraphs shall have occurred:

                      (1)  Trinity enters into an agreement, the consummation of
                which would result in the occurrence of a Change in Control;

                      (2) Trinity or any Person publicly announces an intention
                to take or to consider taking actions which, if consummated,
                would constitute a Change in Control;

                      (3) any Person becomes the Beneficial Owner, directly or
                indirectly, of securities of Trinity representing 15% or more of
                either the then outstanding shares of common stock of Trinity or
                the combined voting power of Trinity's then outstanding
                securities (not including in the securities beneficially owned
                by such Person any securities acquired directly from Trinity or
                its affiliates); or

                      (4) the Board adopts a resolution to the effect that, for
                purposes of this Plan, a Potential Change in Control has
                occurred.

         5. The second paragraph of Section 7.5 of the Plan is hereby amended by
adding to the end thereof the following clause:

         ; provided, however, that the provisions of this Section 7.5 shall be
         of no force and effect from and after the occurrence of a Change in
         Control (as defined above).

                                        6

<PAGE>

         IN WITNESS WHEREOF, the Company has caused this Amendment to be
executed by a duly authorized officer of the Company as of the day and year
first above written.

                                 TRINITY INDUSTRIES, INC.

                                 By: /s/ W. RAY WALLACE
                                    ----------------------------------

                                        7

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