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                                                                    EXHIBIT 10.2

                            TRINITY INDUSTRIES, INC.
                          SUPPLEMENTAL RETIREMENT PLAN
                                 AMENDMENT NO. 3

      Pursuant to the provisions of Section 6.1 thereof, the Trinity Industries,
Inc. Supplemental Retirement Plan, as amended from time to time, (the "Plan"),
is hereby further amended, effective as of April 1, 1999, as set forth below:

      FIRST: Section 2.12 of the Plan is hereby amended by restatement in its
entirety to read as follows:

      2.12  Participant shall mean an Employee who meets the Eligibility
            Requirements as determined by the Plan Committee; provided, however,
            that effective on and after the date of a Change in Control, the
            term "Participant" shall be limited to those individuals who satisfy
            the Eligibility Requirements and who were Participants in this Plan
            as of the date immediately prior to the date of such Change in
            Control.

      SECOND: Section 4.6 of the Plan is hereby amended by restatement in its
entirety to read as follows:

      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 in the form of a single life annuity for
            the life of the Participant with a ten-year period certain and shall
            commence at age 65. In calculating the amount of a Participant's
            benefit payments hereunder, the Participant's benefit shall be
            calculated pursuant to Section 4.4 of this Plan assuming that the
            Base Plan benefit is to commence at the same time that benefit
            payments are to commence hereunder and will be made in the form of a
            single life annuity for the life of the Participant with a ten-year
            period certain (without regard to when the Participant has elected
            to have such Base Plan benefit commence and without regard to the
            form of the benefit selected under the Base Plan). Notwithstanding
            the preceding provisions of this Section, a Participant may elect a
            form of benefit payment under this Plan other than the form
            described above from among those optional forms of benefit payments
            available under the Base Plan at the time of the election, and/or
            may elect to begin the commencement of benefit payments on an
            earlier date than at age 65, with the payment amount to be adjusted
            for a different form of benefit or commencement date using the
            actuarial assumptions provided in the Base Plan; provided, however,
            that such an election with respect to an alternative form of benefit
            payments and/or earlier commencement of benefit payments may be made
            by a Participant only once during any calendar year, and the
            election will be effective only if the election is made more than 12
            months prior to the earlier of (i) the date benefit payments would
            commence under this Plan

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            without regard to the election or (ii) the date benefit payments
            would commence under this Plan pursuant to the election.

            The preceding provisions of this Section 4.6 to the contrary
            notwithstanding, any Participant (or beneficiary of a deceased
            Participant) who has commenced receiving benefit payments under this
            Plan and who has more than one benefit payment remaining to be paid
            may elect in writing on a form acceptable to the Company to waive
            his right to continue receiving benefit payments hereunder and in
            lieu thereof to receive one lump sum payment in an amount equal to
            90% of the present value of the benefit payments remaining to be
            paid at the time of such lump sum payment. The present value shall
            be determined using the actuarial assumptions that would be used for
            calculating lump sum distributions under the Base Plan, and the
            payment will be made in cash to the Participant (or beneficiary of a
            deceased Participant) no later than 15 days following receipt of his
            election by the Company. In the event that a Participant (or
            beneficiary of a deceased Participant) receives a lump sum payment
            in accordance with this provision, no further benefits will be owed
            to or on account of such Participant under this Plan and the
            remaining 10% of the present value of the monthly payments shall be
            forfeited.

      IN WITNESS WHEREOF, the Company has caused this Amendment to be executed
by a duly authorized officer of the Company on this ___ day of _______________,
1999.

                                          TRINITY INDUSTRIES, INC.

                                          By___________________________
                                            Title:

                                      -2-<PAGE>

                                                                    EXHIBIT 10.3

                               AMENDMENT NO. 4 TO
                            TRINITY INDUSTRIES, INC.
                          SUPPLEMENTAL RETIREMENT PLAN

      WHEREAS, TRINITY INDUSTRIES, INC. (the "Company") has heretofore adopted,
for the benefit of certain executive and managerial employees, the TRINITY
INDUSTRIES, INC. Supplemental Retirement Plan (the "Plan"); and

      WHEREAS, pursuant to Section 6.1 of the Plan, the Company desires to amend
the Plan in certain particulars.

      NOW, THEREFORE, the Plan is hereby amended in the following respects:

      1.    Section 4.3 of the Plan is hereby revised to be and read 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 such Base Plan as of
      the date of such termination by taking into account Sections 401(a)(17)
      and 415 of the Code, plus (iii) if the applicable Base Plan is the Trinity
      Industries, Inc. Standard Pension Plan any increase in such difference
      attributable to a determination of the Participant's `accrued benefit'
      under such Standard Pension Plan by taking into account as `Compensation'
      amounts otherwise excluded under the Supplemental Profit Sharing Plan for
      Employees of Trinity Industries, Inc. and Certain Affiliates, with the
      total of such amount payable to the Participant in a lump sum cash payment
      within five (5) 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:

            (a)   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 Beneficial
                  Owner in connection with a transaction described in clause (i)
                  of paragraph (c) below; or

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            (b)   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 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 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

            (c)   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 of
                  any parent thereof) at least 60 percent 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 acquisitions by
                  Trinity or its Affiliates of a business representing 30
                  percent or more of the combined voting power of Trinity's then
                  outstanding securities; or

            (d)   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 of Trinity of all or
                  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 percent 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.

                                        2

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            `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 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."

      2.    Section 4.4 of the Plan is hereby revised to be and read as follows:

"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 except for the operation of Section 401(a)(17) or Section 415 of
      the Code, plus if the applicable Base Plan is the Trinity Industries, Inc.
      Standard Pension Plan, any increase in such difference attributable to a
      determination of the Participant's `accrued benefit' under such Standard
      Pension Plan by taking into account as `Compensation' amounts otherwise
      excluded under the Supplemental Profit Sharing Plan for Employees of
      Trinity Industries, Inc. and Certain Affiliates. 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."

      IN WITNESS WHEREOF, the Company has executed this Amendment No. 4 on the
_____ day of _________________, 2004, effective as of _________________ ____,
_____.

                                          TRINITY INDUSTRIES, INC.

                                          By:___________________________________

                                          Title:________________________________

ATTEST:

__________________________

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