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A bit out of date, but this interactive map of step free London is very good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 :
Catford is on ThamesLink, and is not accessible to wheelchair users to access platforms. See pictures and further accessible transport in London detail from links below.
Underground lines : ThamesLink
AccessAble Access Guide :
Accessibility friendly : No step free access to platforms.
General description : See wiki
More comment : National Rail Guide & Maps