All the London railway stations :
Underground lines : Central, London Overground (West London line), National Rail Southern
AccessAble Access Guide :
Accessibility friendly : The London Overground station is very accessibility friendly. All trains carry a ramp for wheelchair access - Please seek assistance from station staff.
The Central Underground line is not accessible to wheelchair users due to stairs between the platform and street level.
General description : See wiki
More comment : National Rail Map & Guide,
Inclusive Britain Station Guide