Illinois Central installs light signals on 21 mi of three tracks with five electromechanical interlockers.
Signaling increases capacity of three tracks
Ry. Signal Engr
Railway Signal Engineer ; 16 , n 3
1923
7 pages
18 Figs.
Article (Journal)
English
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Signaling two tracks to capacity
Engineering Index Backfile | 1925
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Engineering Index Backfile | 1925
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