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The National Rail Access Map names 2590 Stations in England, Scotland and Wales. You can search this map by station.
All the London railway stations :
National Rail : ThamesLink
Upper Warlingham station has Step-free access via main entrance and car park to platform 1 (to London). No step-free access to platform 2 (to Oxted).
Upper Warlingham station car park has 240 spaces including 2 Accessible spaces.
General description : wiki
National Rail Map & Guide.