Project on Pittsburgh and Lake Erie includes centralized control of four interlocking layouts and signaling for train movements both ways on middle track, with single-direction running on other two tracks.
To remove fourth main track
Ry Signaling Communications
Railway Signaling and Communications ; 48 , n 10
1955
3 pages
Article (Journal)
English
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Third and fourth track construction
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|Pointing at Side Track, without Interruption of Main Track
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