1 EXHIBIT 21 Trinity Industries, Inc. Listing of Subsidiaries of the Registrant The Registrant has no parent. At March 31, 1998, the operating subsidiaries of the Registrant were: Percentage of Organized voting securities under the owned by the Name of subsidiary laws of Registrant - --------------------------------------- ------------ ----------------- Beaird Industries, Inc. Delaware 100% Helmsdale, Limited Isle of Man 100% International Industrial Indemnity Co. Vermont 100% Standard Forged Products, Inc. Delaware 100% Syntechnics, Inc. Delaware 100% Syro, Inc. Ohio 100% Transit Mix Concrete & Materials Company Delaware 100% Transit Mix Concrete & Materials Company of Louisiana Louisiana 100% Trinity DIFCO, Inc. Delaware 100% Trinity Casteel, Inc. Delaware 100% Trinity Equipment Co., Inc. Delaware 100% Trinity Financial Services, Inc. Delaware 100% Trinity Fitting & Flange Group, Inc. Delaware 100% Trinity Industries do Brasil, Ltda. Brazil 100% Trinity Industries Buffalo, Inc. Delaware 100% Trinity Industries Leasing Company Delaware 100% Trinity Industries de Mexico SA de CV Mexico 100% Trinity Industries Real Properties, Inc. Delaware 100% Trinity Industries Transportation, Inc. Texas 100% Trinity Marine Caruthersville, Inc. Delaware 100% Trinity Marine Nashville, Inc. Delaware 100% Trinity Marine Orange, Inc. Delaware 100% Trinity Marine Port Allen, Inc. Delaware 100% Trinity Marine Products, Inc. Delaware 100% Trinity Materials, Inc. Delaware 100% Trinity Mobile Railcar Repair, Inc. Delaware 100% Trinity Rail, Inc. Delaware 100% Trinity Rail Management, Inc. Delaware 100% Transcisco Trading Company Delaware 100% Trinity Rail Services, Inc. California 100%