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A bit out of date, but this interactive map of step free London is very good
All the London railway stations :
Edgware is on the Northern underground, and is accessible to wheelchair travellers between street level and platforms; but mind the steps! See pictures and further accessible transport in London detail from links below.
Underground lines : Northern
Accessibility friendly : Partial. (A step 130-197mm/gap 1-23mm)
General description : High steps do make this station a problem. Lift access between street and platform, although the Inclusive guide below suggests there is no lift, and just stairs. The TFL step-free map also shows this station as accessible except for wide step onto train.