<ACCESSION-NUMBER>0001140361-18-040856 <TYPE>8-K <PUBLIC-DOCUMENT-COUNT>10 <PERIOD>20181017 <ITEMS>8.01 <ITEMS>9.01 <FILING-DATE>20181018 <DATE-OF-FILING-DATE-CHANGE>20181018 <FILER> <COMPANY-DATA> <CONFORMED-NAME>TRINITY INDUSTRIES INC <CIK>0000099780 <ASSIGNED-SIC>3743 <IRS-NUMBER>750225040 <STATE-OF-INCORPORATION>DE <FISCAL-YEAR-END>1231 </COMPANY-DATA> <FILING-VALUES> <FORM-TYPE>8-K <ACT>34 <FILE-NUMBER>001-06903 <FILM-NUMBER>181128156 </FILING-VALUES> <BUSINESS-ADDRESS> <STREET1>2525 STEMMONS FREEWAY <CITY>DALLAS <STATE>TX <ZIP>75207-2401 <PHONE>214-631-4420 </BUSINESS-ADDRESS> <FORMER-COMPANY> <FORMER-CONFORMED-NAME>TRINITY STEEL CO INC <DATE-CHANGED>19720407 </FORMER-COMPANY> </FILER>