Smash signals power-operated to clear position; no time element involved in emergency release; maintenance costs low; special operating conditions complicate design; no trunking in entire installation.
Automatic interlocking installed by N. Y. C. at crossing with Monon at San Pierre, Ind
Ry. Signaling
Railway Signaling ; 23 , n 8
1930
3 pages
7 Figs.
Article (Journal)
English
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