Our booking engine at tickets.railforums.co.uk (powered by TrainSplit) helps support the running of the forum with every ticket purchase! Find out more and ask any questions/give us feedback in this thread!
Does anyone know where I can find historic line maps? By this I mean post-1950 individual London Underground line maps - i.e. the ones above the doors on the trains and at stations.
Don't know of any websites which have them, other than TfL's which only has current ones. There are, however, quite a few examples on display at the LT Museum Acton if my memory serves me right (no idea if that's of any use to you mind!).
I haven't been in the poster store at Acton yet, but expect that there will be plenty of maps in there. It's a stop on the weekend tours, see here. I would contact the museum if you have an even vaguely convincing research request, they might be able to arrange copies or to take you in at some other time.