In first phase of signal modernization program on Southern Pacific Lines, semaphores between Tucson and Picacho, Ariz, have been replaced with searchlight signals and spring switch mechanism with facing point locks; territory includes 4.6 mi of double track and 42. 6 mi of single track, carrying daily 11 passenger and four freight trains and additional extra freight trains.
SP modernizes automatic block
Ry Signaling Communications
Railway Signaling and Communications ; 47 , n 7
1954
3 pages
Aufsatz (Zeitschrift)
Englisch
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