Swissvale, Penn. Union Switch & Signal Company, 1930. Soft Cover. 8vo. Bulletin No. 144. Orig. wrappers, 51pp. Illustrated. Name on half-title, light soiling to wrappers with wear to paper on front cover (lettering partially affected) o/w very good. The development of the cab signal in Pennsylvania, its functions and systems.....
Trains & Railways
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