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A bit out of date, but this interactive map of step free London is very good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 :
Clapham Common is on the Northern underground route, and is not accessible to wheelchair travel.
There are 19 steps, and an escalators, between the Bookinh hall and the platforms.
The entrance to the booking halls involves 22 to 25 steps.
See pictures and further accessible
transport in London detail from links below.
Clapham Common station
Underground lines : Northern line
Accessibility friendly : Clapham Common is not accessible to wheelchair users due to there being stairs (and escalators) between the street and the platforms.