Tags: Public Transit System.
The Pittsburgh Southern Railway was a railroad in the U.S. state of Pennsylvania. It was formed in March 1879 by the merger of the 3 ft (914 mm) narrow gauge Pittsburgh Southern Railroad (which was the 3 ft 4 in (1016 mm) narrow gauge Pittsburgh Castle Shannon and Washington Railroad from July 1877 to April 1878) Pittsburgh Railroad and Washington Railroad. It ran from Washington to Castle Shannon where it connected to the Pittsburgh and Castle Shannon Railroad.