All the London railway stations :
Underground lines : District, London Overground (North London line), National Rail South West
Accessibility friendly : Partial. District line (A step 153-170mm/gap 63-80mm).
There is lift access between street and platforms, including the District, London Overground and National Rail services.
General description : See wiki
More comment :
National Rail Map & Guide, Richmond is a fully accessible station. There is access to all platforms via staff operated lifts. Please speak to a member of staff if you need to use the lifts.
Inclusive Britain Station Guide