| Here is a "track diagram" of WYE Tower's interlocking and signals located in Duncansville, Pennsylvania. Partial Caption: "Middle Division. Diagram of Tracks and Signals, Hollidaysburg, In Service 11:01 A.M., Monday, Dec. 14, 1931." This is the original right-of-way for the eastern terminus of the Allegheny Portage Railroad, 1834-1854. |