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A bit out of date, but this interactive map of step free London is very good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 : London Overground (Watford DC Line)
AccessAble Access Guide :
Accessibility friendly : The problem at this station is the access to the ticket hall, which has 30 steps to access. South Kenton is therefore not accessible to wheelchair users due to stairs from street level.
General description : See wiki
More comment : National Rail Map & Guide, 30 steps to platforms.