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Signals http://signalbox.org/ pictures of them, how they work, real in depth stuff. An hour or two should be allowed for a decent browse.
Industrial Railway Society http://www.irsociety.co.uk/ . Go to the archive pages in the link on the left of the site for pdfs of loads of their back issues, some written in the 60s when the railways were still operating. You'll need an hour or two though.
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7/8ths Scale >