Electric locks; electromechanical and mechanical interlocking; centralized traffic control; requisites for protection of traffic against sides and rock falls; falling rock, rock slide, and earth slide detectors. (Signal Sec)
Committee II -- Interlocking
Assn Am Railroads -- Advance Reports
Association of American Railroads -- Meeting ; 1941 Interlocking
1941
76 pages
Conference paper
English
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