At this point the most I could concieve is a section of high speed line between Manchester and Leeds, and a short connection onto the Birmingham-Derby line if some way of doing it without requiring electrification can be worked out.
More or less agree with this at least against the "in most of our lifetimes" level of speculation. Only point where I think we differ is whether it might be near-continuous electrification from the HS2 interface to Sheffield.
Services like CrossCountry are very overcrowded and expensive,
If you have a connection to the XC line near Tamworth, then instead of having Nottingham XC meander around Bordesley (and expensive new chord) to access Moor Street, bring them into Curzon Street. Obviously the arthritic 170s get replaced by something like a battery-electric 395. Connecting passengers having to transit between New Street/Moor Street/Curzon Street is already going to become common due to HS2 and MRH West so we can't get too hung up on further direct connectivity loss)
Doing these things has a clear strategic purpose of improving connectivity between Shef/Derb/Notts to the West Midlands and London (and by extension releases capacity on the MML)
A non-high speed upgrade to the Castle Donington Line might support this, providing Nottingham-Brum and Nottingham-London directs as well as via Derby (noting that Trent junctions and the 2 lines into Nottingham are big problems to solve. And also that Nottingham-London via this route may not be much improvement on today's timings.
I reckon in this world, Leicester-Brum via Derby might also be as quick as direct.
However if HS2 trains are serving Derby towards Sheffield, I can't see how either the original HS2 East or IRP alignments (M1 corridor and Erewash Line) make sense.
Sheffield remains a mess. I think there are now 3 dilemmas where I see no clarity
1. Whether to serve Midland and spend £££ on capacity upgrades, or spend £££ on a brand new line that only serves Meadowhall remains unresolved
2. Is London even the priority, or should it be Manchester or Leeds first?
3. Does the North want genuine high-speed rail, or does it really want these new super-trains to serve all sorts of medium to large towns like Rotherham, Barnsley, Wakefield etc.
The point of the crayons here is really to highlight these choices to clients and stakeholders.
I suggest you'd have to find a project that can be built in the Chinese style (almost entirely on a viaduct) with the minimum of mass demolitions or anything of that nature.
A new scheme into London does not sound advisable on that basis.
This is a very important point that politicians and others keen to descope Euston HS2 could not or would not grasp. We won't get another shot at building a new railway into London. So it's silly to kill off options that we might wish we had by not future proofing Euston. Manchester Victoria is a decent example of this error. We have long been changing making use of redundant infrastructure buildings like Manchester Central, Bankside Power Station or the Point Depot in Dublin for other purposes. Could do that for a period of where parts of Euston that won't be needed for 10, 20 or 30 years