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To get from Euston to places north of Lichfield, you could either:
- Go on a congested line built by the Victorians with a 125 mph (at best) speed limit filled with stopping trains, freight and lots of intermediate stations.
- Go on a brand new line with a 240 mph speed limit and only two intermediate stations and no other trains.
- Go on a congested line built by the Victorians with a 125 mph (at best) speed limit filled with stopping trains, freight and lots of intermediate stations.
HS2 services will run to Manchester (and similar oop north places) from day one via the connection near Lichfield and the existing network, so they need to fit the existing infrastructure.
Trains built to a larger size would be stuck shuttling between London and Birmingham.
(The "HS2 will run only from London to Birmingham" thing is weirdly common in news articles, despite having never been true)