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Common Carrier Freight Railroads in the United States - K
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.

Kanawha River Railroad (KNWA) (WATX)
Kanawha River Terminal (KRT)
Kankakee, Beaverville and Southern Railroad (KBSR)
Kansas and Oklahoma Railroad (KO) (WATX)
Kansas City Southern Railway (KCS)
Kansas City Transportation Lines (KCTL) (KAW) (WATX)
Kaw River Railroad (KAW) (WATX)
Keenesburg Direct Railroad (KDR)
Kendallville Terminal Railway (KTR) (PREX)
Kennewick Terminal Railroad (KEWT) (FTRX)
Kentucky and Tennessee Railway (KT)
Keokuk Junction Railway (KJRY) (PREX)
Kettle Falls International Railway (KFR) (OMLX)
Kiamichi Railroad (KRR) (GWRR)
Kingman Terminal Railroad (KGTR) (PATR)
Kinston and Snow Hill Railroad (KSH) (G&O)
Kiski Junction Railroad (KJR)
Klamath Northern Railway (KNOR)
KM Railways (KMR)
Knoxville and Holston River Railroad (KXHR) (G&O)
Kodak Park Railroad (KPK) (KODK) (RSS)
KWT Railway (KWT) (GWRR)
Kyle Railroad (KYLE) (GWRR)