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A bit out of date, but this interactive map of step free London is very good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 :
National Rail : ThamesLink
Accessibility friendly : There is no step-free accessto both platforms. There is step-free interchange available between platforms, although boarding ramps are not available. Nearest step-free station is London Bridge.
General description : See wiki
More comment : National Rail Map & Guide.