EXHIBIT 21 TRINITY INDUSTRIES, INC. LISTING OF SUBSIDIARIES OF THE REGISTRANT The Registrant has no parent. At March 12, 2003, the operating subsidiaries of the Registrant were: <Table> <Caption> PERCENTAGE OF VOTING SECURITIES OWNED BY THE NAME OF SUBSIDIARY ORGANIZED IN REGISTRANT - ------------------ ------------ ----------------- Apromat, S.A. -- Arad Romania 50% Astra Vagoane, S.A. -- Arad Romania 96% ICPV, S.A. -- Arad Romania 89% International Industrial Indemnity Co. Vermont 100% Reunion General Agency, Inc. Texas 100% Syro, Inc. Ohio 100% Transit Mix Concrete & Materials Company Delaware 100% Transit Mix Concrete -- Baytown, Inc. Texas 100% Transit Mix Concrete & Materials Co. of Louisiana Louisiana 100% Trinity Argentina S.R.L Argentina 100% Trinity EE, Inc. Delaware 100% Trinity Fittings Group, Inc. Delaware 100% Trinity Industries Buffalo, 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 Mexico, 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 GmbH Switzerland 100% Wagonmarket, spol. s.r.o Slovak Republic 100% Trinity Rail do Brasil, Ltda. Brazil 100% Trinity Industries Leasing Company Delaware 100% Trinity Financial Services, Inc. Delaware 100% Trinity Marine Leasing, Inc. Delaware 100% Transport Capital, LLC Illinois 100% Trinity Industries Railcar Corporation Delaware 100% Trinity Industries Transportation, Inc. Texas 100% Trinity Marine Products, Inc. Delaware 100% Trinity Materials, Inc. Delaware 100% Trinity Mining Services, Inc. Delaware 100% Trinity Rail Group, LLC Delaware 100% Thrall Europa, s.r.o Czech Republic 100% Thrall Vagonka Studenka, a.s Czech Republic 95% Thrall International Holdings LLC Illinois 99% Thrall Europa Eng. & Wales 100% Thrall Company Delaware 100% Rail Project, s.r.o Slovak Republic 100% Thrall Trinity Freight Car, Inc. Delaware 100% DIFCO, Inc. Ohio 100% Trinity Rail Components & Repair, Inc. Delaware 100% McConway and Torley Corporation Pennsylvania 100% MCT Properties, Inc. Delaware 100% McConway and Torley -- Anniston, Inc. Delaware 100% Standard Forged Products, Inc. Delaware 100% Trinity Railcar Repair, Inc. Delaware 100% Trinity Rail GmbH Switzerland 100% Trinity Tank Car, Inc. Delaware 100% Trinity Rail, Inc. Delaware 100% </Table> <Table> <Caption> PERCENTAGE OF VOTING SECURITIES OWNED BY THE NAME OF SUBSIDIARY ORGANIZED IN REGISTRANT - ------------------ ------------ ----------------- Trinity Rail Management, Inc. Delaware 100% TILX GP I, LLC Delaware 100% TILX LP I, LLC Delaware 100% Trinity Rail Market Services, Inc. Delaware 100% Trinity Structural Towers, Inc. Delaware 100% TRN Investment Company, Inc. Delaware 100% TRN, Inc. Delaware 100% TRN Business Trust Delaware 100% </Table>