Present day working timetables are very different from those of the 1950s. To take the Met line as an example differences between the 1950s and today include: In the 1950s there was still a Met service to Aylesbury. In the 1950s southbound off peak Met services only ran as far as Baker Street. Services beyond there during the peaks ran to either Liverpool Street or Aldgate. There was still some freight traffic operating on the Met line in the 1950s.
Much the same arguments could be made about the Bakerloo service and also of course the BR services on the GC line which was then still open as a through route beyond Aylesbury.
Incidentally which part of the 1950s were you intending modelling, as the track layout at Wembley Park was substantially altered in 1954?
Old timetables are regularly obtainable on Ebay, which is where I picked up the 1959 District and Picc WTT I wanted a year or so ago. That was essentially to get set numbers and destinations correct for some stock already constructed. You may be interested to see Steve Smith's long established 'London Road' layout which is based on the Met and Bakerloo in the Neasden vicinity in the fifties/sixties. I'll be assisting him with it on Sat Nov 12th at the Romford Model Railway Exhibition, Marshalls Park School, Pettits Lane, Romford, Essex.