Great Walton Railroad GP9 rests in Covington, Georgia wearing the GWR's sharp white, yellow, and green paint scheme.
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Great Walton Railroad GP9 rests in Covington, Georgia wearing the GWR's sharp white, yellow, and green paint scheme.

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Classic Streamliners - TRAIN​CYCLOPEDIA

Common Carrier Freight Railroads in the United States - G
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.

Galveston Railroad (GVSR) (GWRR)
Garden City Western Railway (GCW) (PREX)
Gardendale Railroad (GRD) (IHRX)
Gary Railway (GRW) (TSTR)
Gateway Eastern Railway (GWWE) (KCS)
Geaux Geaux Railroad (GOGR)
Georges Creek Railway (GCK)
Georgetown Railroad (GRR)
Georgia and Florida Railway (GFRR) (OMLX)
Georgia Central Railway (GC) (GWRR)
Georgia Northeastern Railroad (GNRR) (PATR)
Georgia Southwestern Railroad (GSWR) (GWRR)
Georgia Woodlands Railroad (GWRC) (OMLX)
Gettysburg and Northern Railroad (GET) (PREX)
Golden Isles Terminal Railroad (GITM) (GWRR)
Golden Isles Terminal Wharf (GITW) (GWRR)
Golden Triangle Railroad (GTRA) (PATR)
Grafton and Upton Railroad (GU)
Grainbelt Corporation (GNBC) (FMRC)
Grand Elk Railroad (GDLK) (WATX)
Grand Rapids Eastern Railroad (GRE) (GWRR)
Grand River Railway (GRRY)
Great Lakes Central Railroad (GLC)
Great Northwest Railroad (GRNW) (WATX)
Great Smokey Mountains Railroad (GSMR)
Great Walton Railroad (GRWR)
Great Western Railway of Colorado (GWR) (OMLX)
Green Mountain Railroad (GMRC) (VTR)
Greenville and Western Railway (GRLW) (WCRSC)
Grenada Railway (GRYR) (IPH)
Gulf Coast Switching (GCSX) (ARH)

See also:

Heritage Railroads

Railroads of the U.S.A.