Panel type control machine uses thumb type turn and push levers; turn or signal lever completes route check network, and lights exit lamp on track diagram, and lever is pushed to clear signal; plan shows track layouts and signals of entire new interlocking.
Pennsylvania railroad installs large modern interlocking at passenger station in Philadelphia
Ry Signaling Communications
Railway Engineering and Maintenance ; 45 , n 5
1952
5 pages
Article (Journal)
English
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