Railway signal systems : hearing before the Committee on Interstate and Foreign Commerce, Seventy-fifth Congress, first session on H.R. 185, a bill to promote the safety of employees and travelers on railroads by requiring common carriers engaged in interstate commerce to install, inspect, test, repair, and maintain block-signal systems, interlocking, highway grade crossing protective devices, automatic train-stop train-control, cab-signal devices, and other appliances methods, and systems intended to promote the safety of railroad operations, March 19, 1937.

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