I too think they should split the services (and add in an hourly express Carmarthen-Cardiff via the Swansea District Line to maintain through services, keeping the Bridgend passengers off them by not calling so that a 2-car 175 may surfice).
Yes, the doors are wider, meaning less space for seats and/or legroom. Also, putting the doors at the ends means they are not a constraint on the seating layout, which may mean there is more flexibility for getting a good layout. And I know others complain on the forums about draughts (though that's not something I generally bring up). If the legroom is as good as you say, then serivces they might be useful for on W&B (in order of where I think an outer-suburban unit would be most suitable) are as follows:
- Cardiff-Cheltenham all-stops (perhaps extended to/from Swansea as the Swanline service)
- Cardiff-Hereford all-stops (inc. Caerleon)
- Chester-Shrewsbury (additional services following the Wrexham redouble)
- Wrexham-Bidston
- Swansea - Pembroke Dock all-stops
- Llandudno - Liverpool (all-stops to the Halton Curve))
The first two are also candidates for bi-mode operation. The Crewe-Shrewsbury stoppers would be on there too, except that I think they should go to LM to be run by 170s and 3 coaches is a big step up from the present mix of solo 150s and 153s. You could perhaps also put them on Rhymney-Penarth as a stop gap while waiting for electrification.
I've read a claim that a small number (I think 6 units) of D-Trains have been ordered (or are not far off being ordered); but no statement on who has ordered them.
I'm not sure I ever thought about it until we sent my brother to Nottingham as mentioned previously. He's no rail enthusiast, he drives his car everywhere now that he has a license, and he certainly reported following that Cardiff-Nottingham journey that the doors were in the wrong place.
Sounds a mess; how are they going to replace 30 Pacers with a handful of 319s? Unless WAG have got a Pacer derrogation until the wires are up but aren't telling us because keeping Pacers will cause uproar and they hope to keep it under the carpet until after the next assembly election.