Total of 31 flashing-light signals at 13 crossings, controlled with a. c. track circuits, replace 10 flagmen formerly employed 12 hours a day.
Extensive grade crossing protection installed on Pennsylvania
Ry. Signaling
Railway Signaling ; 19 , n 6
1926
3 pages
6 Figs.
Aufsatz (Zeitschrift)
Englisch
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