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Clapham South is on the Northern underground route, and is not accessible to wheelchair travel due to there being stairs (and escalators) between the street and the platforms. See pictures and further accessible transport in London detail from links below.
Clapham South station
Underground lines : Northern
Accessibility friendly : Clapham South is NOT accessible to wheelchair users from street to platform due to there being stairs / escalators between the street and the platforms.
Escalator access between street and platform.
More comment : Inclusive Britain Station Guide