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A bit out of date, but this interactive map of step free London is very good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 :
Dagenham Heathway station in February 2019
Dagenham Heathway is on the District underground, and has step-free to wheelchair users between street level and platforms. The steps / gaps onto the train are however quite large. See pictures and further accessible transport in London detail from links below.
Underground lines : District
Accessibility friendly : Partially accessible. Eastbound towards Upminster (A step 283mm/gap 23mm), westbound towards Earl�s Court (A step 243mm/gap 23mm).
Level access between street and platform. There are large steps / gaps onto the trains.
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