Why should 26m carriages mean that 265m long platforms are necessary? 265m long platforms are available on the majority of the traditional InterCity network, so 11-car Pendolinos and 10-car IEPs/AT300s make perfect sense.
It doesn't, but you are doing the same as you normally do in turning discussions around to cause an argument ! I've responded to the concept of replacement of a double up 350 with a doubled up AT300 (which was suggested by another - as the AT300s aren't to the best of my knowledge replacing the 350s) - I've outlined several thoughts, some more possible than others - would be nice if you could be constructive rather than destructive with every post !
The same isn't true on TP North and there's no real case to spend many tens or hundreds of millions of pounds to extend platforms across the network to support trains with far more capacity than it is ever likely that those platforms will need to support. All four of the main stations in Manchester - Piccadilly, Victoria, Oxford Road and the Airport, are limited to ~200m trains so unless you want to spend lots of money upgrading all of them simultaneously, there's not a great amount of point in doing it.
I'd agree, and no one has suggested that - I originally suggested SDO on some platforms where space was constrained for a very limited number of trains per week, but some places, I.e Piccadilly appear to have the space, Airport would be easy to expand, Oxford Road would be difficult.
If you were going to run 10 car TP trains up to Scotland, it would be best splitting them at Preston so that they can serve a much wider area of the North West of England. If one entire half-train were filled with passengers going from Scotland to Manchester, the other half-train would be for all the passengers going from Scotland to non-Manchester destinations, and it may as well continue on to Liverpool. 330 seats for exclusive use by end-to-end Manchester passengers alone is more than enough capacity.
Well clearly it's not enough, as TPE are running 8 carriage 350s currently on some select busy services - my personal preference is to price passengers onto less busy services, but that's easier said than done
--- old post above --- --- new post below ---
Given the number of units (12) being ordered to operate a slightly expanded service over that currently being provided by ten, I'm not sure why anybody expects to see any multiple working of units through to Manchester, anyway.
Ah, interesting, so TPE would run 12x five carriage units, plus retain all or some of the 10x four carriage 350s ?