Review of progress of railroad crossing signals of Pacific Electric Railway; railroad originates new automatic flagman; cost of installation and maintenance of signals.
Wig-wag warning sign protects crossings
Traction Shop Roadway
Traction Shop and Roadway ; 2 , n 8 ; p 236-237
1929
2 pages
1 Fig.
Aufsatz (Zeitschrift)
Englisch
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