Search london history from Roman times to modern day
A bit out of date, but this interactive map of step free London is very good
All the London railway stations :
Dartford is on the National Rail South Eastern network, and there is Step free access all platforms, but Ramps are needed to board trains.
National Rail South Eastern in TFL Zone 8.
Accessibility friendly : Yes. To platforms.
General description : See wiki
More comment : National Rail
Map & Guide
Whole station. Step free access all platforms, but Ramps are needed to board trains.