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Grange Hill signal box was built by London Transport and the frame was installed in 1939-40 but the re-signalling scheme postponed for duration of the Second World War. It was a non standard design and opened in 1948 fitted with a 35 lever Westinghouse 'N2' frame.
It was closed on 3rd November 1997.
Diagrams
Attached a railway and signaling track diagram from London Transport Central Line Extention 1946 - 1957. This diagram can be downloaded opened in your browser in Adobe PDF format provided the Adobe browser is loaded, otherwise you will be able to save the file to your computer until such time as you have an Adobe Reader installed to read the file - Adobe reader is available free, just use the Adobe Reader icon below to get your copy.
your internet providers line speed. typically file sizes between 300-500K each
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