Wayside signals installed by Pennsylvania on portion of railroad extending from New Paris, Ohio to Columbus are position light type and are spaced 3 mi apart; cab signals consist of four indications: restricting, approach, approach medium, and clear.
Wayside equipment for cab signaling
Ry Signaling Communications
Railway Signaling and Communications ; 48 , n 1
1955
Aufsatz (Zeitschrift)
Englisch
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