All the London railway stations :
Shadwell is not accessible to wheelchair users due to stairs between the platform and street level. There are Lifts, but there are additional stairs making the station inaccessible. This information may be only relevant to the Overground line.
Underground lines : London Overground (East London line)
AccessAble Access Guide :
Accessibility friendly : Shadwell is not accessible to wheelchair users due to stairs between the platform and street level. There are Lifts, but there are additional stairs making the station inaccessible.
General description : See wiki
More comment : National Rail Map & Guide - there are lifts, but the station is still totally inaccessible.
Inclusive Britain Station Guide