TITLE:  Railway signalling, 1933 CREDIT:  NRM   SEEIKE IMAGES St Enoch signalling onheondon, Midland & Scottish Railway, about 1933.he photograph atopeft showshe old signal box at Glasgow's St Enoch station, which had been replaced byhe new building onhe right.he mechanical,ever operated system was replaced byhe Sykes electro-mechanical system, illustrated at bottomeft. Atop right ishe interior of a signal box operated by electricity. he miniatureever frames were connectedo electrically-powered signals and points. At bottom right is a substation which generatedhe power for electrically-operated signalling. Spacer image In Collection of: National Railway Museum. Visit http://www.ingenious.org.uk/ for images and viewpointshat brings insight into science and culture

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