So: 12/14 cars on ECML services (possible, it's been done already)
Hull/GC reinforced
VT with 11+ car trains
HSTs onto the MML from GWR and VTEC/LNER.
10 coach Chilterns (HST?)
That should do the trick...
I invite you to google 'HS2 route map' you will find that that's false.
We can build a new set of tracks along the WCML for most of it.
We can use the Watford DC line for commuter services.
Freights can be sped up or sent onto the Chiltern Line.
Trains can be run at up to 20 coaches like elsewhere. Alstom et al. can rustle up a few coaches if we need them and of course we can use the Mk3 high speed carriage.
All of the money will be value for money as we will be upgrading and giving people a better service but for less money.
We will be allowing a country more worthy of HSR to enjoy it.
Oh where to start...
Ok-12 to 14 car trains on the ECML? Where & when has this happened? Platform lengths at Kings Cross (and probably several other locations) won’t allow for such long trains.
HST’s are up to 43 years old & as tough as they are, won’t last forever. They can only ever be a short term solution. They would also need a lot of work doing to make them compliant with Equality regulations.
Again, there will be few, if any stations on the Chiltern route that can handle 10 car trains.
What is the obsession for building two extra lines on the same alignment as the current WCML? If you consider that HS2 is building two new fast lines, then the existing route fast lines become semi-fast & the current slow lines stay as they are. There’s no need for the new fast lines to adjoin the existing route, because the services on the fast lines won’t be calling anywhere on that route.
Part of the rationale for HS2 is to provide more regional services. That can’t be done at present.
As has been explained about the DC lines, they were shoehorned around the existing alignment (a darn good argument for NOT building an extra 2 lines alongside the WCML). No one has yet explained how you deal with Watford Junction.
When referencing “southern WCML”, it is London to Rugby that is congested, not just the bit to Watford.
Freight trains are HEAVY and cannot just be “sped up”. Extra capacity is needed on the existing WCML-hence HS2. You certainly can’t send freight trains on the Chiltern line f you’re proposing running frequent 10 car passenger services along it either. Also, getting to the Chiltern line from the North London Line May be a challenge.
Aside from France, there are few locations in the world that operate “20 car trains”. The UK rail network was a pioneer, but because it was the first, it lacks capacity for very long trains etc.