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A bit out of date, but this interactive map of step free London is very good
All the London railway stations :
Underground lines : Bakerloo, London Overground (Watford DC Line), ThamesLink
Accessibility friendly : The London Overground & National Rail is allegedly step free, with separate lifts for access to each platform. Bakerloo line (A step 217mm/gap 60mm).
There is Lift access between street and platforms, including London Overground and National Rail services.
This station has step-free access to all platforms.
There is level access from the Sandridge Close entrance to platform 1 and ramped access from the Wealdstone entrance to platform 6.
Lifts are available to all other platforms, accessible from both entrances.
General description : See wiki
More comment :
National Rail Map & Guide, plus 5 disabled parking spaces.