At Big Elk, Del, North East, Md, and Winans, three outlying locations involving switches where number of main tracks change from four to three, Pennsylvania has replaced mechanical inter-lockings with power switches and signals controlled remotely from two centralized traffic control type control machines, code apparatus being used to control field functions and to bring in indications.
Remote control on Pennsylvania
Ry Signaling
Railway Signaling ; 29 , n 7
1936
4 pages
Article (Journal)
English
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Remote control on Pennsylvania
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