Illustrated description of interlocking installed at west end of yards near Portland, Me, by Portland Terminal Co, to replace mechanical plant at P.T. Tower 1 that had been in service since 1896; plug-in relays, aerial cable and circuit improvements are features of new plant.
All-relay electric interlocking on Portland Terminal
Ry Signaling
Railway Signaling ; 38 , n 10
1945
6 pages
Article (Journal)
English
© Metadata Copyright Elsevier B. V. All rights reserved.
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