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A bit out of date, but this interactive map of step free London is very good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 :
West Hampstead Thameslink is on ThamesLink . See pictures and further accessible transport in London detail from links below.
Accessibility friendly : This station has step-free access to all platforms / the platform.
General description : See wiki
More comment : National Rail ThamesLink Map & Guide.