I would suspect much of the noise from a train at speed is rail noise. That said, some modern electrics, like the new Eurostars, seem to be alarmingly loud, louder than most diesels. The power car corridor looks very narrow. I would imagine most passengers won't use it. It might be a consequence of using v engines rather than straight engines.
It's definitely traction motor noise as it only comes from the outer bogies.
Almost sounds like a pocket sized HST!
Well, once everything's in service, perhaps the most interesting itinerary for stock-bashing would be an all-Stadler tour London-Stansted-Norwich-London. London-Stansted Airport on a 745/1, change to a bi-mode 755 at Stansted, running on electric to Ely, then on diesel to Norwich, then back to London on a 745/0.
They will work the service to Ipswich, which at some point is due to become hourly and extend most of the day to Colchester.
Ely? It's quaint, has a nice riverside and an amazing cathedral. And the station is a big junction with lots of traffic. It's 40 mins from Peterborough. Also, the bi-modes will change over to electric here.
Perhaps not ultra-luxury - but including provision of hot food and alcoholic drinks with the fare will tend to make it much more expensive than it ought to be on the merits of accommodation alone!
Years ago it was possible to travel off-peak in first class for a small fee - say £10. I think that should be reintroduced.
