Arrangements to cut off current from affected section in 20 to 25 seconds; controller governed by brake system; other features.
"Safety" and "operating" developments on the underground railways
Ry. Gaz
Railway Gazette ; 36 , n 22
1922
4 pages
6 Figs.
Aufsatz (Zeitschrift)
Englisch
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Track circuit developments on the underground railways
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