Exhibit 21

Trinity Industries, Inc. Active Subsidiaries as of December 31, 2020
Name of Subsidiary	Domicile	Ownership Percentage
CJB Prime Property, LLC	Delaware	100	%
International Industrial Indemnity Company	Vermont	100	%
Reunion General Agency, Inc.	Texas	100	%
Trinity Argentina S.R.L.	Argentina	100	%
Trinity Corporate Services, LLC	Delaware	100	%
Heritage Aviation Services LLC	Nevada	100	%
TRN Services, LLC	Delaware	100	%
HLA Engineers, Inc.	Texas	41	%
Vigilant Systems, Inc.	Texas	100	%
Trinity Highway Products, LLC	Delaware	100	%
QEAS, Inc.	Delaware	100	%
E-Tech Testing Services, Inc.	Delaware	100	%
Energy Absorption Systems, Inc.	Delaware	100	%
EAS Road Products, Inc.	Delaware	100	%
EAS Road Products (Singapore Branch), Inc.	Delaware	100	%
Quixote International Enterprises, LLC	Delaware	100	%
Trinity Highway Rentals, Inc.	Delaware	100	%
Trinity Industries International, Inc.	Delaware	100	%
Trinity Industries Leasing Company	Delaware	100	%
RIV 2013 Rail Holdings LLC	Delaware	31	%
Trinity Rail Leasing 2012 LLC	Delaware	100	%
RIV II, LLC	Delaware	100	%
TILX GP V, LLC	Delaware	100	%
Trinity Rail Leasing V LP	Texas	1	%
TILX LP V, LLC	Delaware	100	%
Trinity Rail Leasing V LP	Texas	99	%
Trinity Marks Company	Delaware	100	%
Trinity Rail, Inc.	Delaware	100	%
TrinityRail Leasing Management, Inc.	Delaware	100	%
TILX GP I, LLC	Delaware	100	%
Trinity Rail Leasing I LP	Texas	1	%
TILX LP I, LLC	Delaware	100	%
Trinity Rail Leasing I LP	Texas	99	%
TrinityRail Canada Inc.	Brit Columbia	100	%
Trinity Rail Leasing 2010 LLC	Delaware	100	%
Trinity Rail Leasing 2017 LLC	Delaware	100	%
Trinity Rail Leasing 2018 LLC	Delaware	100	%
Trinity Rail Leasing 2019 LLC	Delaware	100	%
Trinity Rail Leasing 2020 LLC	Delaware	100	%
Trinity Rail Leasing VII LLC	Delaware	100	%
Trinity Rail Leasing Warehouse Trust	Delaware	100	%
TRIP Rail Holdings LLC	Delaware	43	%
TRIP Rail Master Funding LLC	Delaware	100	%
TrinityRail Investment Holding Company LLC	Delaware	100	%

Trinity Industries, Inc. Active Subsidiaries as of December 31, 2020
Name of Subsidiary	Domicile	Ownership Percentage
TRIHC 2018 LLC	Delaware	100	%
Dynamic Rail Leasing LLC	Delaware	15	%
Trinity Industries Metals Laboratory, Inc.	Delaware	100	%
Trinity Industries Railcar Corporation	Delaware	100	%
Trinity Logistics Group, Inc.	Texas	100	%
Trinity Central Maintenance, LLC	Delaware	100	%
Trinity Rail Group, LLC	Delaware	100	%
TrinityRail International Holdings, LLC	Illinois	100	%
TrinityRail Commercial Services, LLC	Delaware	100	%
Trinity Rail de Mexico, S. de R.L. de C.V.	Mexico	33	%
Trinity Rail Sabinas, S. de R.L. de C.V.	Mexico	33	%
Trinity Rail de Mexico, S. de R.L. de C.V.	Mexico	67	%
Trinity Rail Sabinas, S. de R.L. de C.V.	Mexico	67	%
TrinityRail Products and Services, LLC	Delaware	100	%
FreightLucid, LLC	Delaware	100	%
Trinity Heads, Inc.	Delaware	100	%
Trinity North American Freight Car, Inc.	Delaware	100	%
Trinity Parts & Components, LLC	Delaware	100	%
Trinity Tank Car, Inc.	Delaware	100	%
TrinityRail Engineering Works, LLC	Delaware	100	%
TrinityRail Maintenance Services, Inc.	Delaware	100	%
MCM Railyard, LLC	Delaware	100	%
Trinity Bay Worx, LLC	Delaware	100	%
TrinityRail Asset Management Company, Inc.	Delaware	100	%
Waldorf Properties, Inc.	Delaware	100	%
McConway & Torley – Anniston, Inc.	Delaware	100	%
Platzer Shipyard, Inc.	Delaware	100	%
Standard Forgings Corporation	Delaware	100	%