    <SEC-DOCUMENT>0000099780-20-000129-index.html : 20201022
    <SEC-HEADER>0000099780-20-000129.hdr.sgml : 20201022
    <ACCEPTANCE-DATETIME>20201022143639
    ACCESSION NUMBER:		0000099780-20-000129
    CONFORMED SUBMISSION TYPE:	8-K
    PUBLIC DOCUMENT COUNT:		26
    CONFORMED PERIOD OF REPORT:	20201021
    ITEM INFORMATION:		Results of Operations and Financial Condition
    ITEM INFORMATION:		Regulation FD Disclosure
    ITEM INFORMATION:		Financial Statements and Exhibits
    FILED AS OF DATE:		20201022
    DATE AS OF CHANGE:		20201022

    FILER:

    	COMPANY DATA:
    		COMPANY CONFORMED NAME:			TRINITY INDUSTRIES INC
    		CENTRAL INDEX KEY:			0000099780
    		STANDARD INDUSTRIAL CLASSIFICATION:	RAILROAD EQUIPMENT [3743]
    		IRS NUMBER:				750225040
    		STATE OF INCORPORATION:			DE
    		FISCAL YEAR END:			1231

    	FILING VALUES:
    		FORM TYPE:		8-K
    		SEC ACT:		1934 Act
    		SEC FILE NUMBER:	001-06903
    		FILM NUMBER:		201254274

    	BUSINESS ADDRESS:
    		STREET 1:		2525 STEMMONS FREEWAY
    		CITY:			DALLAS
    		STATE:			TX
    		ZIP:			75207-2401
    		BUSINESS PHONE:		214-631-4420

    	MAIL ADDRESS:
    		STREET 1:		2525 N STEMMONS FREEWAY
    		CITY:			DALLAS
    		STATE:			TX
    		ZIP:			75207

    	FORMER COMPANY:
    		FORMER CONFORMED NAME:	TRINITY STEEL CO INC
    		DATE OF NAME CHANGE:	19720407
    </SEC-HEADER>
    <DOCUMENT>
    <TYPE>8-K
    <SEQUENCE>1
    <FILENAME>trn-20201021.htm
    <DESCRIPTION>8-K
    <TEXT>
    Document 1 - file: trn-20201021.htm

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>EX-99.1
    <SEQUENCE>2
    <FILENAME>exh991pressrelease9302.htm
    <DESCRIPTION>EX-99.1
    <TEXT>
    Document 2 - file: exh991pressrelease9302.htm

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>EX-99.2
    <SEQUENCE>3
    <FILENAME>q32020exh992-conferenc.htm
    <DESCRIPTION>EX-99.2
    <TEXT>
    Document 3 - file: q32020exh992-conferenc.htm

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>EX-99.3
    <SEQUENCE>4
    <FILENAME>trinityq32020earningscal.htm
    <DESCRIPTION>EX-99.3
    <TEXT>
    Document 4 - file: trinityq32020earningscal.htm

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>EX-101.SCH
    <SEQUENCE>5
    <FILENAME>trn-20201021.xsd
    <DESCRIPTION>XBRL TAXONOMY EXTENSION SCHEMA DOCUMENT
    <TEXT>
    Document 5 - file: trn-20201021.xsd

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>EX-101.CAL
    <SEQUENCE>6
    <FILENAME>trn-20201021_cal.xml
    <DESCRIPTION>XBRL TAXONOMY EXTENSION CALCULATION LINKBASE DOCUMENT
    <TEXT>
    Document 6 - file: trn-20201021_cal.xml

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>EX-101.DEF
    <SEQUENCE>7
    <FILENAME>trn-20201021_def.xml
    <DESCRIPTION>XBRL TAXONOMY EXTENSION DEFINITION LINKBASE DOCUMENT
    <TEXT>
    Document 7 - file: trn-20201021_def.xml

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>EX-101.LAB
    <SEQUENCE>8
    <FILENAME>trn-20201021_lab.xml
    <DESCRIPTION>XBRL TAXONOMY EXTENSION LABEL LINKBASE DOCUMENT
    <TEXT>
    Document 8 - file: trn-20201021_lab.xml

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>EX-101.PRE
    <SEQUENCE>9
    <FILENAME>trn-20201021_pre.xml
    <DESCRIPTION>XBRL TAXONOMY EXTENSION PRESENTATION LINKBASE DOCUMENT
    <TEXT>
    Document 9 - file: trn-20201021_pre.xml

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>10
    <FILENAME>logoa1911.jpg
    <TEXT>
    Document 10 - file: logoa1911.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>11
    <FILENAME>trinityq32020earningscal001.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 11 - file: trinityq32020earningscal001.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>12
    <FILENAME>trinityq32020earningscal002.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 12 - file: trinityq32020earningscal002.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>13
    <FILENAME>trinityq32020earningscal003.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 13 - file: trinityq32020earningscal003.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>14
    <FILENAME>trinityq32020earningscal004.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 14 - file: trinityq32020earningscal004.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>15
    <FILENAME>trinityq32020earningscal005.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 15 - file: trinityq32020earningscal005.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>16
    <FILENAME>trinityq32020earningscal006.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 16 - file: trinityq32020earningscal006.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>17
    <FILENAME>trinityq32020earningscal007.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 17 - file: trinityq32020earningscal007.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>18
    <FILENAME>trn-20201021_g1.jpg
    <TEXT>
    Document 18 - file: trn-20201021_g1.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>XML
    <SEQUENCE>19
    <FILENAME>trn-20201021_htm.xml
    <DESCRIPTION>IDEA: XBRL DOCUMENT
    <TEXT>
    Document 19 - file: trn-20201021_htm.html

    Document 19 - RAW XML: trn-20201021_htm.xml

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>XML
    <SEQUENCE>20
    <FILENAME>R1.htm
    <DESCRIPTION>IDEA: XBRL DOCUMENT
    <TEXT>
    Document 20 - file: R1.htm

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>EXCEL
    <SEQUENCE>21
    <FILENAME>Financial_Report.xlsx
    <DESCRIPTION>IDEA: XBRL DOCUMENT
    <TEXT>
    Document 21 - file: Financial_Report.xlsx

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>XML
    <SEQUENCE>22
    <FILENAME>Show.js
    <DESCRIPTION>IDEA: XBRL DOCUMENT
    <TEXT>
    Document 22 - file: Show.js

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>XML
    <SEQUENCE>23
    <FILENAME>report.css
    <DESCRIPTION>IDEA: XBRL DOCUMENT
    <TEXT>
    Document 23 - file: report.css

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>XML
    <SEQUENCE>24
    <FILENAME>FilingSummary.xml
    <DESCRIPTION>IDEA: XBRL DOCUMENT
    <TEXT>
    Document 24 - file: FilingSummary.html

    Document 24 - RAW XML: FilingSummary.xml

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>JSON
    <SEQUENCE>27
    <FILENAME>MetaLinks.json
    <DESCRIPTION>IDEA: XBRL DOCUMENT
    <TEXT>
    Document 27 - file: MetaLinks.json

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>ZIP
    <SEQUENCE>28
    <FILENAME>0000099780-20-000129-xbrl.zip
    <DESCRIPTION>IDEA: XBRL DOCUMENT
    <TEXT>
    Document 28 - file: 0000099780-20-000129-xbrl.zip

    </DOCUMENT>
    </SEC-DOCUMENT>