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A bit out of date, but this interactive map of step free London is very good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 :
I visited Tufnell Park station on the Northern line in June 2019, and the station is seriously NOT accessible. My notes suggest 11 steps, then a ramp, then lifts, plus a few stairs at the station entrance. The lifts are great, shame about the stairs. There are no raised platforms onto the train, with mind the gap signs everywhere. I think the pictures tell the story!
Tufnell Park station
Tufnell Park Platform - mind the gap
Tufnell Park stairs from Platform
Tufnell Park station lifts - from platform to ticket hall - after climbing the stairs!
Tufnell Park, more stairs to ticket hall
Underground lines : Northern
Accessibility friendly : Tufnell Park is NOT accessible to wheelchair users due to stairs between the platform and street level. There are lifts, but additional stairs make this station inaccessible.