Four large interlockings handle new facilities including many of functions formerly included in 16 old plants; operating difficulties; work completed by stages; Broad Zoo, Penn, and Gray's Ferry interlocking; track and signal plan; indication received on interlocking machine; ground-detector system; interlocking machine rooms; flexible communication system facilities operation; compressors and air lines; duct and cable system; power transmission and distribution.
Signaling Philadelphia terminal of Pennsylvania
Ry. Signaling
Railway Signaling ; 24 , n 3
1931
7 pages
15 Figs.
Article (Journal)
English
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