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A bit out of date, but this interactive map of step free London is very good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 : National Rail Greater Anglia
AccessAble Access Guide :
Accessibility friendly : This is listed as a partial station with the restriction of the 36 steps leading to the platforms, making this station completely inaccessible. For this reason boarding ramps are also not available - surprisingly. You can buy a ticket, but you cannot use it.
General description : See wiki
More comment : National Rail map & guide