 Little remains of Derry's railroading boom, although some might notice an unused railroad right-of-way that extends from Derry westward to PA Route 981, running slightly north but parallel to the currently-used railroad tracks.This was an ill-fated project known as the Derry-Donohoe-Jeannette (DDJ) bypass, in which the Pennsylvania Railroad attempted to build a new main line that would avoid the curves and slopes of the existing main line, bypassing Latrobe and Greensburg.Construction of the bypass began in the 1920s, including a large trestle near Bradenville, but the new route was never completed.