| Pittsburgh Southern Railway | |
|---|---|
| Locale | Pennsylvania |
| Dates of operation | 1876–1884 |
| Predecessor | Pittsburgh, Castle Shannon and Washington Railroad, Pittsburgh Railroad, Washington Railroad |
| Successor | Baltimore and Ohio Short Line |
| Track gauge | 3 ft (914 mm) |
| Length | 37 miles |
The Pittsburgh Southern Railway was a narrow gauge railroad in Pennsylvania. It was formed in March 1879 by the merger of the Pittsburgh Southern Railroad (which was named the 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. An attempt to use the Little Saw Mill Run Railroad as a substitute connection to Pittsburgh led to the Castle Shannon Railroad War of 1878.[1][2]
It was converted to standard gauge in 1883, and was purchased by the Baltimore and Ohio Railroad on November 20, 1884 and reorganized as the Baltimore & Ohio Short Line Railroad.