Union Switch & Signal Co. The Signal in the Cab - Bulletin No. 144. 1930

Softcover. Stiff paper wraps, stapled at the fold. Front cover contains a black-and-white illustration of a speeding train, along with a black-and-white photographic inset of a railway signalman. Measures 6" x 9", 51 pages, in very good condition. Illustrated with three-color maps and black-and-white drawings, photographs and diagrams. Pages 5-20 contain a history of the continuous system of cab signaling, along with various advantages of its use and information about the equipment required for its use. Between pages 20 and 21 is a two-page aerial photograph of a horseshoe-shaped curve in a railroad line in Pennsylvania on which the company's signaling system is used. Pages 21-24 contain information and specifications on the circuitry that powers the system. A section of maps of various railroad lines follows page 24. Three-color maps are accompanied by black-and-white photographic insets of the signaling systems that they use, along with some specifications about those signaling systems. Pages 46-51 contain photographs of the signals used in the signaling system, along with a listing of which railroad lines use the system. Covers have faded at spine, and are slightly scuffed. Light wear and tear to edges and corners. Stamps on front cover indicate that this catalogue came from a catalogue library, including one with date (December 14, 1935) indicating date of receipt by the library. Pages are clean and unmarked. The Union Switch & Signal Company, a manufacturer of railway signaling systems, was based in Swissvale, Pennsylvania. $35.…