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A bit out of date, but this interactive map of step free London is very good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 :
Crofton Park is on ThamesLink, and is partially accessible to wheelchair users to the platforms from road entrances. See pictures and further accessible transport in London detail from links below.
National Rail : ThamesLink
AccessAble Access Guide :
Accessibility friendly : Step free access to platform 2 via Lindal Road. Step free access to platform 1 via Marnock Road. Step free ticket office. No car park.
General description : See wiki
More comment : National Rail Guide & Maps