Illustrated description of recent developments in Great Britain; introduction of signals capable of displaying four different indications has enabled two classes of traffic to run at close headway; adoption of system of "double-blocking"; use of what is termed theater sign indicator, consisting of large number of small electric lamps arranged on square display ground; etc. (See also - n 4378 Dec 8 1939 p 564-6, n 4879 Dec 15 p 582-3, n 4380 Dec 22 p 608-10)
Modern railway signalling practice
Engineer
Engineer ; 168 , n 4381
1939
3 pages
Article (Journal)
English
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