All the London railway stations :
Underground lines : National Rail Chiltern Railways
Accessibility friendly : Flat access to all platforms via lifts.
General description : Wembley Stadium station has been
rebuilt to be step-free between the street and the platforms via a steep ramp.
However, there is a step between platform and train. The station is generally
unstaffed. Therefore, booking via the Passenger Assist system is not useful.
See
wiki
More comment : National Rail Map and guide