Policy of four main groups, Great Western, Southern, London, Midland and Scottish, and London and North Eastern Railways (See also - n 4868 May 13 1949 p 518-21, n 4869 May 20 p 546-8, n 4870 May 27 p 574-8)
Railway signalling developments: 1923-48
Engineer
Engineer ; 187 , n 4871
1949
4 pages
Article (Journal)
English
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