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A bit out of date, but this interactive map of step free London is very good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 : Northern
Step-free access stations have lifts or ramps - or a combination of both - so that customers don't have to use escalators or stairs to move between the street and the platform.
Accessibility friendly : Mill Hill East has a new lift and link bridge, which were built off-site and craned into the station in August 2019, in a complex overnight operation.