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A bit out of date, but this interactive map of step free London is very good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 : ThamesLink
AccessAble Access Guide :
Accessibility friendly : Yes. The main entrance has two steps, but there is access via Railton road and Milkwood road via a ramp or slope which is easy.
General description : Lift to to all platforms. Some wheelchair users may need assistance at the subway entrance which does not have a level threshold. See wiki
More comment : National Rail Guide & Maps