As badly as HS2 has been run, apart from the tunnel length (where HS2 has not too much more than this project) these projects are night and day different. Not just that HS2 Phase 1a/1b is almost double the length and significantly higher design speed (360km/h vs 250km/h), but they are in a different league in terms of civil engineering from the info I can see - this seems to have less than 80 structures (overpasses, bridges, underpasses etc.) whereas HS2 has 175 bridges and 52 viaducts, and some of those are massive (including the longest railway viaduct in the UK).
> this seems to have less than 80 structures (overpasses, bridges, underpasses etc.) whereas HS2 has 175 bridges and 52 viaducts.
Doesn't tunnel beat any of those structures in terms of cost/complexity?
HS2 also includes major stations - a 6 platform one almost entirely underground in west london, a multi-platform extension in central london, a new station in central birmingham, a new 4 platform outside of Birmingham