I left Waterloo for Bournemouth on the 11.05am today.
On the adjacent platform 7 was a 701 unit.
Its coach end information panels on these 10 20m long coaches
shows the width at 2.77 metres.
The old 455s & Thameslink 319s are 2.82m for the same coach length. 377s are 2.80m
Why does almost every new generation of train
have to be thinner than the one before for the same coach length ?
A secret way of saving weight &/or cost or a morbid fear that Network Rail will deem a new train design out of Gauge?
This is not a nerdy question.
The pre privatisation 2.82 width allows 3x2 seating or wider corridor, so more standing or a better ambience.
The 455s are restricted. They are not passed to operate south of Haslemere and are restricted to 20mph through Ascot, for example. As will be noted from the extensive testing/mileage accumulation to date the 701s have penetrated every single part of the network. makes perfect sense to have a "go anywhere" unit.
Note that the standard Mk 3 Intercity coach is 2.74m wide.
Looking up the Aventra classes they are all 2.77m wide, so Bombardier/Alstom have settled on a standard width for all units, with length and door configuration tailored to customer needs.
It's pretty obvious from views of the interior that the 701s have wide internal gangways that are imperceptibly different from the 707s.