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The National Rail Access Map names 2590 Stations in England, Scotland and Wales. You can search this map by station.
Upper Holloway station, Holloway Road, Upper Holloway, Greater London N19 4DJ
All the London railway stations :
Underground lines : London Overground (Gospel Oak to Barking)
Upper Holloway Station has Both platforms accessible via ramps. Step free platform interchange requires a 40m journey via street .
General description : wiki
More comment : National Rail Map & Guide - ramp has a a gradient.