Read before the Ry. Sig. Assn. Explains the advantages as compared with direct current, illustrating the use of the A. C. track circuit as applied to electric traction roads. (Serial, 1st part) (3000 w.) (No. 6236)
The use of alternating currents in railway signaling
R R Age Gaz
1909
Aufsatz (Zeitschrift)
Englisch
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