All the London railway stations :
Underground lines : Victoria, National Rail Greater Anglia
AccessAble Access Guide :
Accessibility friendly : The Victoria underground line is not accessible to wheelchair users due to stairs and escalators between the platforms and street level.
National Rail - Whole station accessible. There are stairs leading down to London Underground which is also a subway between platforms. It is not clear whether the steep ramp is necessary to access platform 2. Accessible entries are via side entrances to individual platforms.
Escalator and lift access between street and platform via the bus station only.
General description : See wiki
More comment : National Rail map & guide