![](https://www.mnnofa.com/wp-content/uploads/2023/10/hs2-what-has-been-built-so-far.jpg)
Extending HS2 to Euston involves digging a 4.5-mile (7.2km) tunnel from Old Oak Common, in the capital’s western suburbs, and building a new station at Euston next to the existing West Coast Main Line terminus, but costs had ballooned to £4.8bn, compared with an initial budget of £2.6bn.
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