RISC OS S.V.R. S&T Department RISC OS
http://www.svrsig.org/
This site describes signalling on the Severn Valley Railway and the activities of the volunteer S&T Department. Mechanical locking and some of the principles of Signal Engineering are explained. Some computer software may be downloaded. It is arranged in six sections.
The site was last updated on 21st June 2012. Worth a look is 1940s railway maps. These maps show GW and Midland boxes and, recently added, some GE/GN boxes. A text search for a box name is included, as well as links to a modern map and a satellite image. Many signalling drawings, box diagrams, dog charts etc. are constantly being added.
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