All the London railway stations :
National Rail : ThamesLink
Accessibility friendly : Step free access to ramp to platform 1 (to Croydon) via side gate, if open. There is one step from main entrance to Ticket Office, and new ramp installed. Steps to platforms 2 (to London), 3 (to Croydon, small number of trains),and 4 (to London, small number of trains). Mobility-impaired customers should book in advance. Nearest step-free station is East Croydon. Generally this station is inaccessible.
General description : See wiki
More comment : National Rail Map & Guide.