A Pennsylvania Railroad Keystone Station sign for Wall interlocking tower on the PRR Main Line between Harrisburg and Altoona. Wall controlled the complex trackwork on the west side of the Denholm Coal Wharf. Based on PRR Drawing Number 78160-A, dated 1926. Developed using Blender 2.79 and TANE SP4 (Build 105766). NOTE: this object is a scenery (building) item. It can be used by placing it next to a building.