Signal towers were erected at yard entrances, crossovers and crossings to throw turnouts and signals, hand up orders and otherwise expedite traffic. The upper floor housed the levers to accomplish the above, and the lower floor was used for battery, tool, and parts storage.  It was a very necessary building for any railroad before Centralized Train Control came into use.   Castings include 21 double hung windows, 2 doors, and 3 smaller rear windows.  All parts are cut to size as much as possible.  Footprint is 3” x 5 ¼”.  Height is 5”.