X0201 42003-08-15 0000099780 TRINITY INDUSTRIES INC NYSE/TRN 0001199848 CUNNINGHAM JACK L JR 2525 STEMMONS FREEWAY DALLAS TX 75207 0100Vice PresidentTrinity Stock Units02003-08-154A0225.38ACommon Stock21906Iby TrustThe Trinity Stock Units were accrued under the Trinity Industries, Inc. Supplemental Profit Sharing Plan and will be settled upon the reporting person's retirement or other termination of service or earlier for in service distributions under limited circumstances as provided by the plan. Stock Units convert at a ratio of 1 to 1. The data in columns 2 and 6 are for filing format purposes only.Michael G. Fortado For: Jack L. Cunningham2003-08-18