Illinois Central installs colored light signals on 20 miles of double track with no normal direction. (See also Ry. Age, vol. 78, no. 15, Mar. 14, 1925, pp. 733-735, 5 figs)
Signaling two tracks to capacity
Ry. Signaling
Railway Signaling ; 18 , n 4 ; p 139-141
1925
3 pages
7 Figs.
Aufsatz (Zeitschrift)
Englisch
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Signaling two tracks to capacity
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