The layout represents the Petersburg Branch of the Pennsylvania Railroad between Hollidaysburg and Petersburg Pennsylvania. In 1925, when I model, the line was double tracked as there were 10 passenger trains a day and many freights serving limestone mines, a papermill and other industries. There were two narrow gauge logging lines that connected to the Petersburg Branch, which I did not have space to model.  Please note, there is a narrow duck under at about 52" high to enter the layout area.