Southern Railway Zone was created in 1951.
Central Railway Zone was created in 1951.
South Central Railway Zone was created in 1966.
Tidewater Southern Railway was created in 1912.
Charleston Southern Railway was created in 1915.
Cincinnati Southern Railway was created in 1869.
Pittsburgh Southern Railway was created in 1879.
Norfolk Southern Railway was created in 1990.
Washington Southern Railway was created in 1890.
Montana Southern Railway was created in 1917.
Southern Manitoba Railway was created in 1999.
Columbus Southern Railway was created in 1886.
Columbia Southern Railway was created in 1897.