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Chalk Farm is on the Northern Underground line, and is not accessible to wheelchair users with stairs impeding access to platforms. See pictures and further accessible transport in London detail from links below.
Underground lines : Northern
Accessibility friendly : Chalk Farm is NOT accessible to wheelchair users due to there being stairs between the street and the platforms. There is a lift at this station but it does not appear to be an entirely step-free route.
More comment : Inclusive Britain Station Guide