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Exhibit 10.18.6

FIFTH AMENDMENT TO
SECOND AMENDED AND RESTATED CREDIT AGREEMENT

     This Fifth Amendment to Second Amended and Restated Credit Agreement (this “Fifth Amendment”) is executed effective as of February 9, 2009 (the “Effective Date”), by and among Trinity Industries, Inc., a Delaware corporation (the “Borrower”), JPMorgan Chase Bank, N.A., as the Administrative Agent (the “Administrative Agent”), and the financial institutions parties hereto as Lenders (individually an “Executing Lender” and collectively the “Executing Lenders”).

WITNESSETH:

     A. The Borrower, the Administrative Agent, the Syndication Agents, the Documentation Agent and the lenders named therein are parties to that certain Second Amended and Restated Credit Agreement dated as of April 20, 2005 as amended by that certain First Amendment to Second Amended and Restated Credit Agreement dated as of June 9, 2006, that certain Second Amendment to Second Amended and Restated Credit Agreement dated as of June 21, 2006, that certain Third Amendment to Second Amended and Restated Credit Agreement dated as of June 22, 2007, and that certain Fourth Amendment to Second Amended and Restated Credit Agreement dated as of October 19, 2007 (as amended, the “Credit Agreement”) (unless otherwise defined herein, all terms used herein with their initial letter capitalized shall have the meaning given such terms in the Credit Agreement).

     B. The Borrower has requested that the lenders party to the Credit Agreement amend the Credit Agreement as set forth herein. Subject to the terms and conditions herein contained, the Executing Lenders have agreed to the Borrower’s request.

     NOW THEREFORE, for and in consideration of the mutual covenants and agreements herein contained and other good and valuable consideration, the receipt and sufficiency of which are hereby acknowledged and confessed, the Borrower, the Administrative Agent and each Executing Lender hereby agree as follows:

     Section 1. Amendments. In reliance on the representations, warranties, covenants and agreements contained in this Fifth Amendment, and subject to the terms and conditions contained herein, the Credit Agreement is hereby amended effective as of the Effective Date, in the manner provided in this Section 1.

          1.1 Additional Definition. Section 1.01 of the Credit Agreement is amended to add thereto in alphabetical order the definition of “Fifth Amendment” which shall read in full as follows:

     “Fifth Amendment” means that certain Fifth Amendment to Second Amended and Restated Credit Agreement dated as of February 9, 2009, among the Borrower, the Administrative Agent and the Executing Lenders defined therein.

          1.2 Amendments to Definitions. The definitions of the terms “Loan Documents”, “Material Subsidiary”, and “Nonrecourse Subsidiary” set forth in Section 1.01 of the Credit Agreement are amended to read in full as follows:

     “Loan Documents” means this Agreement, the First Amendment, the Second Amendment, the Third Amendment, the Fourth Amendment, the Fifth Amendment, the Notes, the Subsidiary Guaranties, the Letters of Credit, any Borrowing Request, any Interest Election Request, any Assignment and Acceptance, the Fee Letter, and all other agreements (including Hedging Agreements) relating to this Agreement, the Loans or the Lender Indebtedness entered into from time to time between or among the Borrower (or

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any or all of its Subsidiaries) and the Administrative Agent or any Lender (or, with respect to the Hedging Agreements, any Affiliates of any Lender), and any document delivered by the Borrower or any of its Subsidiaries in connection with the foregoing, as such documents, instruments or agreements may be amended, modified or supplemented from time to time.

     “Material Subsidiary” means, as of any date of determination, any Subsidiary of the Borrower (other than a Nonrecourse Subsidiary) which is organized under the laws of the United States of America, any State thereof, or the District of Columbia and either (a) has assets (including, without limitation, assets of any subsidiary of such Subsidiary) having a book value as of such date equal to or greater than ten percent (10%) of the consolidated assets of the Borrower and its Subsidiaries, or (b) accounts (together with any subsidiary of such Subsidiary) for more than ten percent (10%) of the consolidated revenues of the Borrower and its Subsidiaries as determined for the most-recently ended four (4) Fiscal Quarter period ending on or prior to such date of determination, or (c) accounts (together with any subsidiary of such Subsidiary) for more than ten percent (10%) of EBITDA of the Borrower and its Subsidiaries as determined for the most-recently ended four (4) Fiscal Quarter period ending on or prior to such date of determination. A Subsidiary of a Material Subsidiary shall not be deemed to be a Material Subsidiary unless such Subsidiary itself meets the requirements of this definition. As of October 19, 2007, “Material Subsidiaries” means the Subsidiaries set forth (and designated as such) on Schedule 3.11.

     “Nonrecourse Subsidiary” means a Subsidiary that, as of any date of determination, (a) has no Indebtedness for borrowed money except Indebtedness that is non-recourse to the Borrower or any of it Subsidiaries (other than such Subsidiary) or to such Subsidiary’s Property other than Property financed by the Indebtedness in question pursuant to customary non-recourse provisions (including normal and customary exceptions to the non-recourse nature thereof) or (b) is created for the sole purpose and business of owning and holding specific Property financed by Indebtedness and does not, and by the terms of its organizational documents, or other agreement to which it or its Property are subject, can not, (i) own or hold any Property other than the specific Property financed by such Indebtedness or similar Property, (ii) participate in any other business or (iii) incur any Indebtedness other than the Indebtedness to finance the specific Property and Indebtedness permitted by clause (l) of Section 7.01).

     Section 2. Effectiveness of Amendment. This Fifth Amendment shall be effective automatically and without the necessity of any further action by the Administrative Agent, the Borrower or any Lender when counterparts hereof have been executed by the Administrative Agent, the Borrower, the Required Lenders and the Material Subsidiaries (which may include telecopy or other electronic transmission of a signed signature page of this Fifth Amendment) shall have been received by the Administrative Agent, and each of the following conditions to the effectiveness hereof have been satisfied:

     (a) Representations. The representations and warranties contained herein and in all other Loan Documents, as amended hereby, shall be true and correct in all material respects as of the Effective Date as if made on the Effective Date, except for such representations and warranties limited by their terms to a specific date;

     (b) Default. After giving effect to this Fifth Amendment, no Default shall exist; and

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     (c) Other Proceedings. All proceedings taken in connection with the transactions contemplated by this Fifth Amendment and all documentation and other legal matters incident thereto shall be satisfactory to the Administrative Agent and its counsel.

     Section 3. Representations and Warranties of the Borrower. To induce the Executing Lenders and the Administrative Agent to enter into this Fifth Amendment, the Borrower and each Material Subsidiary (by its execution of this Fifth Amendment below), represent and warrant to the Administrative Agent and the Lenders as follows:

          3.1 Reaffirmation of Representations and Warranties. Each representation and warranty of the Borrower and each Material Subsidiary contained in the Credit Agreement and the other Loan Documents is true and correct in all material respects on the date hereof after giving effect to the amendments set forth in Section 1 hereof but except for such representations and warranties limited by their terms to a specific date.

          3.2 Due Authorization, No Conflicts. The execution, delivery and performance by the Borrower and each Material Subsidiary of this Fifth Amendment and the Loan Documents executed pursuant hereto are within the Borrower’s and each Material Subsidiary’s corporate powers, have been duly authorized by all necessary action, require no action by or in respect of, or filing with, any governmental body, agency or official and do not violate or constitute a default under any provision of applicable law or any material agreement binding upon the Borrower or any of its Subsidiaries, or result in the creation or imposition of any Lien upon any of the assets of the Borrower or any of its Subsidiaries except for Permitted Encumbrances.

          3.3 Validity and Binding Effect. This Fifth Amendment constitutes the valid and binding obligation of the Borrower enforceable in accordance with its terms, except as (a) the enforceability thereof may be limited by bankruptcy, insolvency or similar laws affecting creditor’s rights generally and (b) the availability of equitable remedies may be limited by equitable principles of general application. This Fifth Amendment constitutes the valid and binding obligations of each Material Subsidiary enforceable in accordance with its terms, except as (a) the enforceability thereof may be limited by bankruptcy, insolvency or similar laws affecting creditor’s rights generally and (b) the availability of equitable remedies may be limited by equitable principles of general application.

          3.4 No Defenses. As of the date hereof, neither the Borrower nor any Material Subsidiary has any defenses to payment, counterclaim or rights of set-off with respect to their respective obligations under the Loan Documents.

          3.5 Absence of Defaults. After giving effect to the amendments set forth in Section 1 hereof, no Default exists.

     Section 4. Miscellaneous.

          4.1 Reaffirmation of Loan Documents. The terms and provisions set forth in this Fifth Amendment shall modify and supersede all inconsistent terms and provisions set forth in the Credit Agreement and except as expressly modified and superseded by this Fifth Amendment, the terms and provisions of the Credit Agreement and the other Loan Documents are ratified and confirmed and shall continue in full force and effect. Borrower, the Material Subsidiaries, the Administrative Agent, and the Lenders agree that the Credit Agreement as amended hereby and the other Loan Documents shall continue to be legal, valid, binding and enforceable in accordance with their respective terms except as (a) the enforceability thereof may be limited by bankruptcy, insolvency or similar laws affecting creditor’s rights generally and (b) the availability of equitable remedies may be limited by equitable principles of

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general application. Borrower agrees that the obligations, indebtedness and liabilities of the Borrower arising under the Credit Agreement, as amended by this Fifth Amendment are “Obligations” as defined in the Subsidiary Guaranties.

          4.2 Parties in Interest. All of the terms and provisions of this Fifth Amendment shall bind and inure to the benefit of the parties hereto and their respective successors and assigns.

          4.3 Counterparts. This Fifth Amendment may be executed in counterparts, and all parties need not execute the same counterpart. Facsimiles or other electronic communications (e.g., pdf) shall be effective as originals.

          4.4 Complete Agreement. THIS FIFTH AMENDMENT, THE CREDIT AGREEMENT AND THE OTHER LOAN DOCUMENTS REPRESENT THE FINAL AGREEMENT AMONG THE PARTIES WITH RESPECT TO THE SUBJECT MATTER HEREOF AND THEREOF AND MAY NOT BE CONTRADICTED BY EVIDENCE OF PRIOR, CONTEMPORANEOUS OR ORAL AGREEMENTS OF THE PARTIES. THERE ARE NO UNWRITTEN ORAL AGREEMENTS BETWEEN OR AMONG THE PARTIES.

          4.5 Headings. The headings, captions and arrangements used in this Fifth Amendment are, unless specified otherwise, for convenience only and shall not be deemed to limit, amplify or modify the terms of this Fifth Amendment, nor affect the meaning thereof.

          4.6 Survival of Representations and Warranties. All representations and warranties made in this Fifth Amendment shall survive the execution and delivery of this Fifth Amendment, and no investigation by the Administrative Agent or any Lender or any closing shall affect the representations and warranties or the right of the Administrative Agent or any Lender to rely upon them.

          4.7 Reference to Agreement. Each of the Loan Documents, including the Credit Agreement and any and all other agreements, documents, or instruments now or hereafter executed and delivered pursuant to the terms hereof or pursuant to the terms of the Credit Agreement as amended hereby, are hereby amended so that any reference in such Loan Documents to the Credit Agreement shall mean a reference to the Credit Agreement as amended hereby.

          4.8 Expenses of Lender. As provided in the Agreement, Borrower agrees to pay on demand all costs and expenses incurred by Administrative Agent in connection with the preparation, negotiation, and execution of this Fifth Amendment and the other Loan Documents executed pursuant hereto, including without limitation, the costs and fees of Administrative Agent’s legal counsel.

          4.9 Severability. Any provision of this Fifth Amendment held by a court of competent jurisdiction to be invalid or unenforceable shall not impair or invalidate the remainder of this Fifth Amendment and the effect thereof shall be confined to the provision so held to be invalid or unenforceable.

          4.10 Applicable Law. This Fifth Amendment and all other Loan Documents executed pursuant hereto shall be governed by and construed in accordance with the laws of the State of Texas and the applicable laws of the United States of America.

          4.11 Required Lenders. Pursuant to Section 10.02 of the Credit Agreement, the Credit Agreement may be modified as provided in this Fifth Amendment with the agreement of the Required Lenders which means Lenders having (a) fifty-one percent (51%) or more of the Aggregate Revolving Commitment or (b) if the Aggregate Revolving Commitment has been terminated, fifty-one

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percent (51.0%) or more of the Aggregate Revolving Credit Exposure (such percentage applicable to a Lender, herein such Lender’s “Required Lender Percentage”). For purposes of determining the effectiveness of this Amendment, each Lender’s Required Lender Percentage is set forth on Schedule 4.11 hereto.

     IN WITNESS WHEREOF, the parties hereto have caused this Fifth Amendment to be duly executed by their respective authorized officers on the date and year first above written.

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Material Subsidiary Consent

     Each of the undersigned Material Subsidiaries: (i) consent and agree to this Fifth Amendment (including, without limitation, the terms of Sections 3 and 4.1); (ii) agree that the Loan Documents to which it is a party shall remain in full force and effect and shall continue to be the legal, valid and binding obligation of such Material Subsidiary enforceable against it in accordance with their respective terms except as (a) the enforceability thereof may be limited by bankruptcy, insolvency or similar laws affecting creditor’s rights generally and (b) the availability of equitable remedies may be limited by equitable principles of general application; and (iii) agree that the obligations, indebtedness and liabilities of the Borrower arising under the Credit Agreement as amended by the Fifth Amendment are “Obligations” as defined in each Subsidiary Guaranty.

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SCHEDULE 4.11
TO
FIFTH AMENDMENT
TO
SECOND AMENDED AND RESTATED CREDIT AGREEMENT

REQUIRED LENDER PERCENTAGE

						Lenders Agreeing to Fifth
						Amendment (insert % from prior
						column if Lender signs this Fifth
		Required Lender				Amendment then total
Lender		Percentage Held				percentages in this column)
JPMorgan Chase Bank, N.A.			18 ###-###-####	%
The Royal Bank of Scotland plc			16.470588235	%
Wachovia Bank, N.A.			15.294117647	%
Bank of America, N.A.			15.294117647	%
Lloyds TSB Bank plc			9.411764706	%
Dresdner Bank AG, New York and Grand Cayman Branches			8 ###-###-####	%
Credit Suisse (FKA Credit Suisse First Boston) Cayman Islands Branch			7 ###-###-####	%
Amegy Bank National Association			4.705882353	%
Bank of Texas			4.705882353	%
TOTAL			100	%

SCHEDULE 4.11, Solo Page