Use of swivel type vertical front rods for spring switches, interlocked switches and movable point frogs; yard track indicators for indicating to train the track to be entered. (Signal Sec)
Committee II -- Interlocking
Assn Am Railroads -- Advance Reports
Association of American Railroads -- Advance Reports ; 45 , n 1 ; p 59-62
1948
4 pages
Report
English
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