The Little Saw Mill Run Railroad was a 4 ft 8+1⁄2 in (1,435 mm) standard gauge American coal railroad that was located in Allegheny County, Pennsylvania.
This railroad company was incorporated July 23, 1850, and opened in April 1853.
[1] Originally, it was owned by the Harmony Society, and ran from Temperanceville, Pennsylvania on the Ohio River to Banksville, Pennsylvania, running parallel to Saw Mill Run[2] and Little Saw Mill Run.
In an agreement with the 3 ft (914 mm) narrow gauge Pittsburgh Southern Railroad, it ran dual gauge tracks.
[3][4] The superintendent of the Marine Railway at Sawmill Run for 13 years was Captain Edward Boland.