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The National Rail Access Map names 2590 Stations in England, Scotland and Wales. You can search this map by station.
All the London railway stations :
Barkingside Station, Station Road, Ilford IG6 1NB
Barkingside is only accessible on the eastbound platform towards Woodford. At Woodford you would need to exit the station to cross platforms. I would recommend using the highly accessible bus routes instead. TFL will not tell you about this station, but just point you at their maps which do not describe a station at all.
Underground lines : Central
Accessibility friendly : Partial. You can only enter and exit the eastbound platform for trains towards Woodford (C step 37mm/gap 213mm). Level access between street and eastbound platform only, towards Woodford.
General description :
More comment : TFL do not list Barkingside as accessible at all. Suggestion to travel towards London is to take the bus routes towards Ilford. Route 169 to Ilford, and 25 to Stratford.