US · FMCSA ACTIVE HAZMAT
UNION TANK CAR CO
dba ON-SITE UTLX SERVICES
Chicago, IL 60602 · DOT 461851
Company profile
Web-discovered · as of 2026-07-30
Union Tank Car Company (UTLX) provides mobile tank car cleaning, repair, and inspection services at customer locations across North America under the UTLX Field Services / On-Site UTLX Services brand, often operating as a private fleet for mobile maintenance.
Fleet use
Specialized service
Operating scope
National
Service model
own account
Equipment
specialized
Ownership
Subsidiary
part of Marmon Rail / Berkshire Hathaway
Employees
1001-5000
HQ · 181 W Madison St, Chicago, IL 60602
Official site confirms repair services (utlx.com) and BizWire 2026 confirms ongoing Field Services operations.
Registry record
Source FMCSA · as of 2026-08-01
Fleet size
116
power units
Activity
road freight carrier
private licence
In operation since
1991
221 drivers
Data Services
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