01188cam a22002172  4500001001300000003000500013005001700018008004100035040001800076086002200094099002200116245051400138260003100652300001500683500006500698500004400763650004100807710008500848949001800933999001900951hsl000704647DGPO20170826152503.0100713s1936    dcu          f000 0 eng d  aGPOcGPOdMvI0 aY 4.IN 8/4:SI 2/2  aY 4.IN 8/4:SI 2/200aRailway signal systems :bhearing 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.  a[Washington, D.C.],c1936.  aiii, 39 p.  aDocument for sale by the Superintendent of Documents, paper.  aCRDP Program Historic Shelflist record. 0aRailroadsxSignalingzUnited States.1 aUnited States.bCongress.bHouse.bCommittee on Interstate and Foreign Commerce.  aBEVbFed Docs  c262549d262549