Notes on highway crossing signal; automatic stop; speed control; train operation by signal indication; despatcher's remote control; centalized traffic control; approach lighting; automatic interlockings; car retarders; etc; list of devices used by Pennsylvania Railroad before any other railroad in America. (See also - discussion p 16-19)
Modern railway signaling
Ry Club Pittsburgh -- Off Proc
Railway Club of Pittsburgh -- Official Proceedings ; 32 , n 1 ; p 4-15
1932
12 pages
Article (Journal)
English
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