26 miles south of Chicago, there is triangle of three railroads, each of which cross other two, forming three railroad crossings approximately one-half mile apart; triangle layout included three old mechanical interlockings; controls of two were consolidated, third was replaced by automatic plant.
Interlockings modernized at three railroad crossings
Ry Signaling Communications
Railway Engineering and Maintenance ; 45 , n 3
1952
2 pages
Article (Journal)
English
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Interlockings installed at two crossings
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