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A bit out of date, but this interactive map of step free London is very good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 station is accessible apparently. Note the ramp to platform 1, side entrance to platform 2 and the bridge crossing platforms has 36 steps. Train boarding ramps are not available.
General description : See wiki
More comment : National Rail map & guide