If anything the GRP driving cabs are probably the weakest point now.
Wasn't there talk of some work on a new cab being designed after 43041 hit a tree, near enough destroying the cab?
Chiltern Railway's multi million pound refurbishment has included installing automatic doors between coaches, which cuts out all the noise. There is no need for vestibule doors, as the new exterior doors keep out the noise and there are no openable windows. This also prevents doors slamming onto commuters as they queue with their luggage to alight.
Class 170s have automatic doors between carriages, yet people still moan because there is nothing separating the doors and seating areas. I haven't been on one the Chiltern MK3s but there is the potential of noise from the exterior doors and when stopped at stations in the winter all the lovely cold air will be coming in the train.
There is no need for 2 toilets per carriage - that's overkill. Chiltern have removed one to allow for these improvements.
Chiltern have removed more than half the toilets, only around half the carriages have toilets now. Three rather than 9 per train. I disagree that two toilets per carriage is an overkill on long distance services. Travel in Carriage A on an
HST▸ where there is only one toilet in the nearest vestibule and you often have to wait. And the more toilets you have the less chance of them all running out of water, already something the happens quite often on London-Penzance services.
Some luggage racks have gone, but cases can be slid between rows of seats, thanks to Chiltern's excellent layout of all tables. The overhead racks also take a lot more than most modern trains.
In the pictures I've seen I haven't seen any luggage racks left. And it's the luggage racks which are the best at holding the increasingly bigger cases around nowadays. The Chiltern seating layout is never going to be found in
FGW▸ 's MK3s, so they are going to need luggage racks. And on the Summer services to Cornwall the luggage provision on MK3s is already inadequate.