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A bit out of date, but this interactive map of step free London is very good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 :
Blackhorse Road entrance is level, Forest road entrance is 7 steps, car park entrance is 18 steps.
Escalators to Victoria Underground.
But 25 steps to Overground line, between Barking and Gospel oak. .
The entire station, and all platforms are NOT accessible to the wheelchair user either because of steps or escalator travel. See pictures and further accessible transport detail from
links below.
London Overground (Gospel Oak to Barking) & Victoria,
AccessAble Access Guide :
Accessibility friendly : No.
There is Escalator access between street and platform
General description : See wiki
More comment : National Rail Map & Guide There are 25 steps to access Overland platforms. There are 18 steps to Underground.