Chesapeake and Ohio grade crossings in downtown Richmond, Va; color-light signals govern switching movements at industries and freighthouse where streets carry heavy vehicular traffic; two-way radio aids watchman to control traffic lights and railroad signals. (see also Ry Signaling and Communications v 48 n 5 May 1955 p 39-43)
Traffic lights protect crossings
Ry Age
Railway Age ; 138 , n 6
1955
3 pages
Aufsatz (Zeitschrift)
Englisch
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