All lines are track-circuited throughout, single-rail type being used in all cases, except on Central London Ry.; standard track relay is two-element vane type, and track circuit is direct condenser-fed type. (See also - no. 540 Jan. 1925 pp. 30-33)
Signalling on the London underground railways
Ry. Engr
Railway Engineer ; 46 , n 541
1925
4 pages
10 Figs.
Article (Journal)
English
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