Automatic track circuit signaling and power interlocking equipment in service on lines of London Passenger Transport Board includes relays of several kinds, amounting at present to some 13,000; methods and equipment used in inspecting and maintaining relays are illustrated and described.
Maintenance and overhaul of signalling relays
Ry Gaz
Railway Gazette ; 85 , n 12
1946
2 pages
Article (Journal)
English
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