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Classic Streamliners - TRAIN​CYCLOPEDIA

Common Carrier Freight Railroads in the United States - O
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.

Oakland Global Rail Enterprises (OGRE)
Ogeechee Railway (OGEE)
Ohi-Rail Corporation (OHIC)
Ohio Central Railroad (OHCR) (GWRR)
Ohio South Central Railroad (OSCR) (RRC)
Ohio Southern Railroad (OSRR) (GWRR)
Ohio Terminal Railway (OHIO) (CLEX)
Oil Creek and Titusville Lines, Inc. (OCTL)
Old Augusta Railroad (OAR)
Olympia and Belmore Railroad (OLYO) (GWRR)
Omaha, Lincoln and Beatrice Railway (OLB)
Ontario Central Railroad (ONCT) (FGLK)
Ontario Midland Railroad (OMID)
Orange Port Terminal Railway (OPT)
Oregon Eastern Railroad (OERR)
Oregon Pacific Railroad (OPR)
Oregon Rail Connect (ORC) (FTRX)
Orlando Utilities Commission (OUC)
Otter Tail Valley Railroad (OTVR) (GWRR)
Ouachita Railroad (OUCH)
Owego and Harford Railway (OHRY) (TCIDA)
Ozark Valley Railroad (OVRR) (MPRL)

See also:

Railroads of the U.S.A.

Heritage Railways