Its time to look at four tracking Colwich Stafford with a second Shugborough Tunnel and grade separating Colwich.
It isn’t. Phase 2a was easier, and probably cheaper! Ultimately, building a new two track railway in Staffordshire is going to have the same challenges whether it is specified for 3-400km/h or 200 km/h. The difference being that the former was already consented after the best part of a decade’s hard work.
We hear much about HS2 increasing capacity into Manchester, however doing something like what was done at Bermondsey at Slade Lane would provide extra capacity a lot more cheaply than £36 billion.
How would such a project increase capacity?
In places like France where extensive high speed lines, the lines they replaced are slow goat tracks (and said goat tracks now have appalling residual services).
Not so - the old PLM (Paris, Lyon, Marseille) line was largely 200km/h, the line down to Bordeaux the same, and indeed had some stretches at 210km/h IIRC
We had years of Digswell viaduct not being suitable for anymore traffic yet more traffic was added. Conversely its a relatively short section to quadruple so would seem an appropriate recipient of the phase 2 "windfall".
Absolutely no chance. And it provides no additional capacity on its own.
Your maths is fundamentally flawed because you’ve not checked the data. You are assuming that the saving over that single stretch of railway (Phase 2) must account for the full 35 minutes (actually 34 minutes), if the Phase 1 saving to Manchester is ‘only’ 15 minutes. That is a incorrect assumption, because quoted 15 minute reduction of HS2 Phase 1 to Manchester is compared to the speed record of a specially prepared non-stop speed record train (1hr 54min), whereas all the other journey times including Glasgow are compared to timetabled times. The current fasted time to Manchester is AFAIU 2hr 5m so actually the comparable saving on Phase 1 is 25 minutes. It also ignores the fact that HS2 trains will already be slowing while still on HS2 Phase 1 in order to rejoin the WCML, which wouldn’t happen once Phase 2 is built and the fact that HS2 trains would be slower than current times north of Handsacre.
Is early the right answer.
HS2 Euston to Handsacre with an OOC stop is going to be in the region of 45 minutes. This compares with Euston to Handsacre today of 66mins non stop or 71mins with one stop.
HS2 services will, however, lose time compared to Pendolinos on the route to Manchester via Stoke (a could have minutes) and Scotland (About 7 IIRC).