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Classic Streamliners - TRAIN​CYCLOPEDIA

Common Carrier Freight Railroads in the United States - U
About 700 railroads operate common carrier freight service in the United States. There are about 150,000 miles (240,000 km) of railroad track in the United States, nearly all standard gauge.

Reporting marks are listed in parentheses.

Union County Industrial Railroad (UCIR) (NSHR)
Union Pacific Railroad (UP)
Union Railroad (URR) (TSTR)
Upper Merion and Plymouth Railroad (UMP) (ARCL)
Utah Railway (UTAH) (GWRR)
Utah Central Railway (UCRY) (PATR)

See also:

Railroads of the U.S.A.

Heritage Railways