Search london history from Roman times to modern day
A bit out of date, but this interactive map of step free London is very good
All the London railway stations :
Underground lines : Bakerloo, London Overground.
Accessibility friendly : Two lifts provide step-free access from the main (Old Oak Lane) entrance to all London Overground platforms. Please note: there is no step-free access at the Harrow Road entrance
General description : Bakerloo line northbound towards Harrow & Wealdstone (B step 203mm/gap 103mm), southbound towards Oxford Circus (B step 250mm/gap 110mm).
Lift access between street and platform. See wiki
More comment :
National Rail Map & Guide,