Requisites for track welding or heat treating in track circuit territory; requisites for a-c and d-c coded signal systems; flasher relay; tractive armature d-c neutral interlocking relay; centralized traffic control type neutral d-c relay; requisites for protection of oil sidings; development of proposed inductive coordination measures involving railroad power lines and power equipment. (See also - n 1 Mar 13 1939 p 65-96)
Committee IV -- Automatic block signaling
Assn Am Railroads -- Proc (Signal Sec)
Association of American Railroads -- Meeting ; 1939 Automatic block
1939
23 pages
Conference paper
English
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