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A bit out of date, but this interactive map of step free London is very good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 :
Bickley is on ThamesLink network. The station is not accessible to wheelchair users due to 29 stairs onto platforms. See pictures and further accessible transport detail from links below.
National Rai : ThamesLink
Accessibility friendly : Not suitable for wheelchair access. Nearest Alternative Stations are Orpington or Beckenham Junction.
General description : See wiki
More comment : National Rail Guide & Maps