Mechanical plants replaced at saving of $5000 per year; principle of operation is similar to regular automatic signaling; special feature that prevents departing train from holding signals against other road; neither road can hold crossing for following moves if train is waiting on other line.
Rock island installs several automatic interlockings
Ry. Signaling
Railway Signaling ; 20 , n 1
1927
4 pages
6 Figs.
Article (Journal)
English
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Virginian installs five interlockings near Norfolk, va
Engineering Index Backfile | 1946
Virginian installs five interlockings near Norfolk, va
Engineering Index Backfile | 1946
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