A Pennsylvania Railroad Keystone Station sign for 14th Street interlocking tower on the PRR Main Line in Altoona, PA. 14th Street controlled the passenger tracks on the west side of the Altoona station. NOTE: this object is KIND mesh. It is intended to be used in conjunction with one or more attachment points on another object. The geometric center of this sign's back is where the attachment will occur. Based on PRR Drawing Number 78160-A, dated 1926. Developed using Blender 2.79 and TANE SP4 (Build 105766).