Old semaphore system is being displaced on steam railways by all-electric methods; work of resignaling entire 28 1/2 mi using color light signaling and a-c track circuits carried out by British Power Railway Signal Co; control of colorlight signals and power-operated points is by means of small thumb switches which are incorporated in illuminated track diagram.
Colour signalling on L.N.E.R.
Elec Times
Electrical Times ; 84 , n 2179
1933
2 pages
Aufsatz (Zeitschrift)
Englisch
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