Purple Orange
On Moderation
Maybe similar 'under the hood', but 'Inter City' rolling stock should be suitable for longer journeys, probably end doors, provision of first class, more luggage space, seat reservation hardware. Units long enough to ensure plenty of capacity, possibly ~7 car units depending upon coach length, 125 mph capable for the York Newcastle leg. Local services will need doors at 1/3rds, no first class, and unit length will be constrained by platform length at the smaller stops Top speed 100mph, maybe 110mph. In a sensible world you would probably use a common platform, with different gearing and body shell fit out. Common systems and controls to reduce training requirements.
The trans pennine services would be better suited to a unit that has double doors at third or quarter positions to enable better flow of passengers on/off the train, an intercity layout and 125 mph capability is important too. If the new train was a 6-car tri-mode variant of a 397 with doors at thirds, it would be a far more suitable.