Details of all relay interlocking installed at Willbridge, Ore, by Spokane, Portland and Seattle Railroad; previous arrangement at junction; tower building, interlocking machine, searchlight signals, switch machines, interlocking controls, power supply and track circuit connections described.
S.P. and S. Installs all-relay interlocking
Ry Signaling
Railway Signaling ; 39 , n 9
1946
3 pages
Article (Journal)
English
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