At the likes of Armitage and Golborne the disruption is limited to constructing a new grade separated junction which moves some of the tracks over to one side. This is very similar to what is currently being done at Norton Bridge and most of it can be done without affecting existing services. Meadowhall has no connection to the existing route and the only disruption will be to build a bridge over it to carry HS2 and to make some alterations to passenger facilities so they link to the new stations. It is not yet clear what will happen at Crewe. So the phrase "massive disruption" only really applies to Euston.
According to Network Rail, a large amount of the disruption during the West Coast Route Modernisation could have been avoided. But if HS2's Armitage and Golborne works do not qualify as 'massive disruption', then why would grade separation at Ledburn, or four-tracking Attleborough - Brinklow?
If a new hub station were built at Crewe, the disruption would be enormous.
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