Exhibit 21

Trinity Industries, Inc. Active Subsidiaries as of December 31, 2022
Name of Subsidiary	Domicile	Ownership Percentage
CJB Prime Property, LLC	Delaware	100	%
Heritage Aviation Services LLC	Nevada	100	%
International Industrial Indemnity Company	Vermont	100	%
RailPulse LLC	Delaware	20	%
Reunion General Agency, Inc.	Texas	100	%
Trinity Argentina S.R.L.	Argentina	100	%
TRN Services, LLC	Delaware	100	%
HLA Engineers, Inc.	Texas	41	%
Vigilant Systems, Inc.	Texas	100	%
Trinity Industries Leasing Company	Delaware	100	%
RIV 2013 Rail Holdings LLC	Delaware	31	%
TRP 2021 LLC	Delaware	100	%
TRP 2021 Railcar Holdings, LLC	Delaware	100	%
TRP Railcar Co., LLC	Delaware	100	%
RIV II, LLC	Delaware	100	%
Signal Rail Holdings LLC (Wafra)	Delaware	13	%
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	%
TrinityRail Canada Inc.	British Columbia	100	%
TrinityRail Quasar Holdings Inc.	British Columbia	100	%
Quasar Platform Inc.	Canada	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 2021 LLC	Delaware	100	%
Trinity Rail Leasing 2022 LLC	Delaware	100	%
Trinity Rail Leasing VII LLC	Delaware	100	%
Trinity Rail Leasing Warehouse Trust	Delaware	100	%
TRIP Rail Holdings LLC	Delaware	43	%
Tribute Rail Holdings LLC	Delaware	100	%
Tribute Rail LLC	Delaware	100	%
Triumph Rail Holdings LLC	Delaware	100	%
Triumph Rail LLC	Delaware	100	%

Trinity Industries, Inc. Active Subsidiaries as of December 31, 2022
Name of Subsidiary	Domicile	Ownership Percentage
TrinityRail Investment Holding Company LLC	Delaware	100	%
TRIHC 2018 LLC	Delaware	100	%
Dynamic Rail Leasing LLC	Delaware	15	%
Trinity Industries Railcar Corporation	Delaware	100	%
Trinity Logistics Group, Inc.	Texas	100	%
Trinity Central Maintenance, LLC	Delaware	100	%
Trinity Rail Group, 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	%
Axium Equipment, LLC	Illinois	100	%
Holden America IL, LLC	Illinois	100	%
Holden Sales & Service, LLC	Illinois	100	%
Ramptech, LLC	Illinois	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	%
Trinity Tank Car, Inc.	Delaware	100	%
TrinityRail Maintenance Services, Inc.	Delaware	100	%
MCM Railyard, LLC	Delaware	100	%
Trinity Bay Worx, LLC	Delaware	100	%
Bay Worx Industries, LLC	Texas	100	%
TrinityRail Asset Management Company, Inc.	Delaware	100	%
Waldorf Properties, Inc.	Delaware	100	%
McConway & Torley – Anniston, Inc.	Delaware	100	%
Platzer Shipyard, Inc.	Delaware	100	%