The tunnels (between Euston and Ruislip) to be lined will run between West Ruislip and Euston station and will have a total length of 26 miles, the same length as Crossrail.
https://www.ianvisits.co.uk/blog/2021/08/13/hs2-tunnel-segements-to-be-build-in-kent/
cover tunnel photo by: Matt Brown from London, England / CC BY
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https://www.ianvisits.co.uk/blog/2021/08/13/hs2-tunnel-segements-to-be-build-in-kent/
HS2 tunnel segments to be built in Kent
www.ianvisits.co.ukThe concrete tunnel lining segments that will form the HS2 tunnel between Euston and Ruislip are to come from a factory next to the River Medway in Kent.