The local lines between Campbell Junction and Upminster were once signalled using LMS Mirfield signalling, quite different from the LT signalling or mainline semaphore/colour light signalling found elsewhere on the District.
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The Mirfield system was also used on the Bakerloo north of Queens Park and had some very odd features indeed. For instance at Bushey the starting signal had 4 searchlight signals on a single pole but each with it's own head. The thing would display 4 red lights as it was a junction signal also. The light that went OUT indicated which route you were taking. For greater information there is a book named "British Railway Signalling" By G.M.Kitchenside and Alan Williams published by Ian Allen which gives all the information required and also colour illustrations of the different types of signalling that have been used in this country including LT. I don't know if this publication is still available but your local library service MAY have a copy.
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Below is the information I have found regarding this book:-
. British Railway Signalling. (4th Edition.)
KICHENSIDE, G.M., & WILLIAMS, Alan
London: Ian Allan Ltd., 1978. 4th ed. "In this publication we have endeavoured to explain the procedure followed for the safe working of trains on British Railways ..." Pp. 136, b/w illustrations throughout, 55 figures, owner's name to verso ...
Offered by Beckham Books Ltd (United Kingdom) £5.00
(About 9.61 USD)
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2. BRITISH RAILWAY SIGNALLING
Kichenside G.M. and Alan Williams
Ian Allan.. Small 8vo with illustrated laminated boards. A history of signalling on British railways. Illustrated throughout. Pp 104. GOOD. . ...
Offered by Wolf Online Ltd (United Kingdom) £7.50
(About 14.41 USD)
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3. BRITISH RAILWAY SIGNALLING
Kichenside, G. M. and Williams, Alan
London: Ian Allan Ltd. fine, pictorial boards (hardcover). (1980). HC. 136pp. ISBN 0711008981 First published in 1963. Contents include: Development of British Signalling; Types of Signal--Semaphore; Types of Signal--Colour-Light; Allied Safety Devices; ...
Offered by Ray Boas, Bookseller - ABAA - rayboasbookseller.com (New Hampshire, United States) $20.00
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Something has just ocurred to me. In the days of yore pre-1960 when the DR east of Bow was under LTS control and signals were the electric lines equipped with the Hudd AWS as well as trainstops? In similar fashion to the Wimbledon road has track magnets. I can't for the life of me remember seeing the Hudd magnets on the DR tracks in the old days.
