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Railroad and Railway Service

Oberlin and La Grange Railway4
Ocilla and Irwinville Railroad5
Ocilla, Pinebloom and Valdosta Railway2
Ogden and Hot Springs Railway1
Ogdensburg and Lake Champlain Railroad343
Ogdensburgh, Clayton and Rome Railroad15
Ogemaw and Northwestern Railway4
Ohio and Indiana Railroad10
Ohio and Mississippi Railroad1182
Ohio and Mississippi Railroad Eastern Division223
Ohio and Mississippi Railroad Western Division111
Ohio and Pennsylvania Railroad11
Ohio Central Railroad22
Ohio River Junction Railroad4
Ohio River Railroad5
Ohio Southern Railroad10
Ohio Valley Railway101
Oil Creek and Allegheny River Railway6
Oil Creek Railroad21
Old Colony and Fall River Railroad21
Old Colony and Newport Railroad12
Old Colony Railroad203
Old River and Kissatchie Railway4
Omaha Bridge and Terminal Railway5
Orange and Alexandria Railroad121
Orange and Northwestern Railroad8
Orange Belt Railway81
Oregon and California Railroad8
Oregon Pacific Railroad6
Oregon Railroad and Navigation Company283
Oregon Railway and Navigation Co12
Oregon Short Line Railroad272
Orford Mountain Railway6
Oswego and Rome Railroad14
Oswego and Syracuse Railroad29
Oswego and Troy Railroad14
Otis Railway4
Ottawa, Northern and Western Railway11
Owasco River Railroad7
Owensboro and Nashville Railroad6
Oxford and Henderson Railroad1
Ozark and Cherokee Central Railway5