Exhibit 21

TRINITY INDUSTRIES, INC.

Subsidiaries as of February 15, 2007

	Organized	Ownership
Name of Subsidiary	under laws of	Percentage
International Industrial Indemnity Company	Vermont	100%
Reunion General Agency, Inc.	Texas	100%
Transit Mix Concrete & Materials Company	Delaware	100%
Transit Mix Transportation Services, LLC	Delaware	100%
Trinity Materials, Inc.	Delaware	100%
Transit Mix Concrete & Materials Co. of Louisiana	Delaware	100%
Trinity Argentina S.R.L.	Argentina	100%
Trinity Containers, LLC.	Delaware	100%
Trinity Financial Services, Inc.	Delaware	100%
Trinity Heads, Inc.	Delaware	100%
Trinity Highway Products, LLC.	Delaware	100%
Trinity Industries International, Inc.	Delaware	100%
Trinity Industries International Holdings AG	Switzerland	100%
Administradora Especializada, S. de R.L. de C.V	Mexico	100%
Grupo Tatsa, S. de R.L. de C.V	Mexico	100%
Trinity Industries de México, S. de R.L. de C.V.	Mexico	100%
OFE, S. de R.L. de C.V.	Mexico	100%
Asistencia Profesional Corporativa, S.de R.L. de C.V.	Mexico	100%
Servicios Corporativos Tatsa, S. de R.L. de C.V	Mexico	100%
Trinity Industries do Brasil, Ltda.	Brazil	100%
Trinity Industries Leasing Company	Delaware	100%
Transport Capital, LLC	Delaware	16.7%
Trinity Marine Leasing, Inc.	Delaware	100%
Trinity Marks Company	Delaware	100%
TILX GP II, LLC	Delaware	100%
Trinity Rail Leasing II L.P.	Texas	1%
TILX LP II, LLC	Delaware	100%
Trinity Rail Leasing II L.P.	Texas	99%
Trinity Rail Leasing Trust II	Delaware	100%
TILX GP III, LLC	Delaware	100%
Trinity Rail Leasing III L.P.	Texas	1%
TILX LP III, LLC	Delaware	100%
Trinity Rail Leasing III L.P.	Texas	99%
TILC Equity OP GP III-C, LLC	Delaware	100%
TILC Equity OP III-C L.P.	Texas	1%
TILC Equity OP LP III-C, LLC	Delaware	100%
TILC Equity OP III-C L.P.	Texas	99%
TILX GP IV, LLC	Delaware	100%
Trinity Rail Leasing IV LP	Texas	1%
TILX LP IV, LLC	Delaware	100%
Trinity Rail Leasing IV LP	Texas	99%
Trinity Industries Railcar Corporation	Delaware	100%
Trinity Logistics Group, Inc.	Texas	100%
Trinity Central Maintenance, LLC	Delaware	100%
Trinity Marine Products, Inc.	Delaware	100%
Trinity Industries Metals Laboratory, Inc.	Delaware	100%

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	Organized	Ownership
Name of Subsidiary	under laws of	Percentage
Trinity Rail Group, LLC	Delaware	100%
Trinity Rail de Mexico, S. de R.L. de C.V.	Mexico	100%
Trinity Rail Sabinas, S. de R.L. de C.V.	Mexico	100%
Thrall International Holdings LLC	Illinois	100%
Trinity Rail UK	Engl.& Wales	100%
Trinity North American Freight Car, Inc.	Delaware	100%
DIFCO, Inc.	Ohio	100%
Trinity Parts & Components, LLC.	Delaware	100%
McConway & Torley, LLC	Delaware	100%
Standard Forged Products, LLC.	Delaware	100%
Trinity Railcar Repair, Inc.	Delaware	100%
Trinity Rail GmbH	Switzerland	100%
Trinity Tank Car, Inc.	Delaware	100%
Trinity Rail, Inc.	Delaware	100%
Trinity Rail Management, Inc.	Delaware	100%
TILX GP I, LLC	Delaware	100%
Trinity Rail Leasing I L.P.	Texas	1%
TILX LP I, LLC	Delaware	100%
Trinity Rail Leasing I L.P.	Texas	99%
Trinity Specialty Products, Inc.	Delaware	100%
Trinity Structural Towers, Inc.	Delaware	100%

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