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Description: | This Ealing Broadway signal cabin, pictured in 1951 by the Topical Press Agency, has both old and new signalling systems. The original signal frame and switching equipment are in use on the left. These interlocking floor signals are named and numbered as to the area on the track they control. In the background are the more modern miniature signals powered by electricity.
Many types of interlocking frame signals were available. The interlocking mechanism prevented signals for conflicting routes from being switched, which could cause an accident. Many manufacturers followed the tappet system of interlocking invented by Steven and Sons. This high-quality tappet lever frame was probably made by Westinghouse, which was still in business in 2005. | Format: | image/jpeg | Publisher: | London Transport Museum | Rights holder: | Transport for London | Subjects: | Transport | Temporal: | Oct 1951 | Source: | London Transport Museum | Identifier: | http://www.20thcenturylondon.org.uk/rser... | Language: | en-GB | Format: | image/jpeg | Go to resource |
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