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A bit out of date, but this interactive map of step free London is very good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 :
Chafford Hundred is a station on the C2C Fenchurch Street line, and is deemed to be accessible. See pictures and further accessible transport in London detail from links below.
National Rail lines : The Station is on the C2C line from Fenchurch Street and runs via Barking, and Upminster.
AccessAble :
Accessibility friendly : Yes, allegedly.
General description : See wiki
More comment : National Rail Map & Guide, the station has 5 disabled parking spaces.