Electropneumatic switch operating mechanism; circuit controller for drawbridges; requisites for mechanically locking levers of interlocking machines; interlocking at drawbridges for protection of trains; electro-mechanical interlocking machine; methods of protecting railroads crossing at grade where traffic conditions do not justify interlocking plant.
Committee II -- Interlocking
Assn Am Railroads -- Proc (Signal Sec)
1938
18 pages
Article (Journal)
English
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