Committee reports of Am. Ry. Assn. on valuation, economics of signaling, standard designs, mechanical interlocking a.c. signaling, batteries, d.c. relays, oils.
Meeting of signal section in New York
Ry. Signal Engr
Railway Signal Engineer ; 15 , n 12
1922
11 pages
8 Figs.
Article (Journal)
English
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