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Harold Wood Station is on the new Accessible Elizabeth line within TFL.
This station has step-free access to all platforms. Including lifts.
Trains run every ten minutes towards London, and end at Paddington, rather than stopping at the original Liverpool street station terminus, they are now redirected via Whitechapel through the new Liverpool street (Elizabeth line) statin which is in a very long tunnel, and involves a lot of walking to exit this station or change lines.
You can change trains along the Elizabeth line to travel as far as Heathrow (or Reading). On the London section of the Elizabeth line between Whitechapel and Paddington, there are trains running every five minutes with alternate services starting from either Shenfield or Abbey Wood; these are on the same platform.
See timetables at TFL for accurate details.
All in all, the new Elizabeth line is amazing. Absolutely brilliant.
The new Elizabeth line trains have a massive gap between the platform and the train of at least fifteen inches, and ramps are available on request.
There is a car park at Harold Wood station which is accessible from the platforms coming from London, oherwise you need to use the lifts to reach the station entrance and booking hall.
AccessAble Access Guide :
General description : See wiki
More comment : National Rail Map & Guide,