I've been able to determine that the route would be from Paddington Station to Verney Junction, (metropolitan railway) and then Verney Junction to Oxford (oxford-bletchley line).
What I want to know, though, is how often would this route be available each day, and, more importantly, how long would it take?
I've searched "railway timetables late 19th century London," "bradshaw railway timetables," "Bradshaw railway timetables 1895," "Bradshaw railway timetables nineteenth century," "1895 train from paddington to Verney junction," and several other permutations on those phrases that I can't remember. I'm getting a lot of interesting information about the history of the railway, but no timetables, or even approximate times.
I only need an approximation--accuracy within about half an hour would be sufficient, to be quite honest, though I'd appreciate as much detail as someone can come up with.