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A bit out of date, but this interactive map of step free London is very good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 : District, Hammersmith & City
Accessibility friendly : There is no accessible entrance or exit for wheelchair users from the platforms due to a number of stairs which count 48 steps from street to platform.
You can change between District line westbound towards Earls Court (A step 153mm/ gap 47mm) and Hammersmith & City line westbound towards Hammersmith (A step 163mm/gap20mm).
You can change from Hammersmith & City line eastbound towards Barking (A step 40mm/gap 33mm) onto District line eastbound towards Upminster (A step 133mm/gap 30mm)