Change of control for two plants accomplishes saving of $11,000 representing 31 per cent on investment; approach and signal-clear indications on machine; unique superimposed a.c. circuits used.
Interlockers replaced by centralized traffic control on the Illinois Central
Ry. Signaling
Railway Signaling ; 23 , n 10
1930
3 pages
5 Figs.
Article (Journal)
English
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