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A bit out of date, but this interactive map of step free London is very good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 :
Underground lines : ThamesLink
AccessAble Access Guide :
Accessibility friendly : The Booking Office is accessible from street. There
are at least 31 Steps to both platforms.
Hadley Wood Station has step-free access between the street and Platform 4 (the northbound platform) via a moderate slope.
General description : See wiki
More comment : National Rail Guide & Maps