01157cam a22002052 4500 hsl000704647 DGPO 20170826152503.0 100713s1936 dcu f000 0 eng d GPO GPO MvI Y 4.IN 8/4:SI 2/2 Y 4.IN 8/4:SI 2/2 Railway signal systems : hearing before subcommittee, 74th Congress, 2d session, on H.R. 2748, to promote safety of employees and travelers on railroads by requiring common carriers engaged in interstate commerce to intall [sic], 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 safety of railroad operation, Mar. 4, 1936. [Washington, D.C.], 1936. iii, 39 p. Document for sale by the Superintendent of Documents, paper. CRDP Program Historic Shelflist record. Railroads Signaling United States. United States. Congress. House. Committee on Interstate and Foreign Commerce. BEV Fed Docs 262549 262549