Union Railroad (Pittsburgh)

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Union Railroad

Overview
Headquarters	1200 Penn Avenue, Suite 300, Pittsburgh, Pennsylvania, 15222
Reporting mark	URR
Locale	Allegheny County, Pennsylvania
Dates of operation	1896–present
Technical
Track gauge	4 ft 8+1⁄2 in (1,435 mm) standard gauge

Union Railroad (reporting mark URR) is a Class III switching railroad located in Allegheny County in Western Pennsylvania. The company is owned by Transtar, Inc., which is a subsidiary of Fortress Transportation and Infrastructure Investors, after being acquired from U.S. Steel in 2021. The railroad's primary customers are the three plants of the USS Mon Valley Works, the USS Edgar Thomson Steel Works (blast furnaces, basic oxygen steelmaking, and continuous slab casting), the USS Irvin Works (hot and cold rolling mills and finishing lines) and the USS Clairton Coke Works (producer of coke for blast furnace ironmaking).