There isn't any obvious solution to the slow door release then; shame. I guess it does have a useful safety benefit though.
In my view the big issue isn't Pontypridd vs Caerphilly but Treherbert/Merthyr Tydfil/Aberdare vs Coryton. Bizarre, from a passenger's point of view, that the latter gets trains with toilet facilities and the others (much further from Cardiff) get trams without. From an operational perspective though, I assume the Welsh Government had the new depot at Taffs Well locked-in when Arriva were still running the trains and the ODP bidders for the new contract had to fit round that? (ODP = Operator and Development Partner).
However, the proposals for extensions make the lack of a toilet an even bigger problem - Aberdare to Cardiff Central is already over an hour, even if the 398s trim that a bit Hirwaun will still in all probability also be over an hour.
Also, the early maps for the South Wales Metro concept also proposals for the following new routes which would branch off from routes which are currently planned to be worked by FLIRTs (although at the time the I don't think it was known what form TfW's new stock would take):
- Caerphilly - Blackwood
- Heath High/Low Level - Cardiff Gate
- Abertillery branch (off Ebbw Vale Line)
- Caerphilly - Treharris
- Pye Corner - Caerphilly
I could be wrong but don't think anything was claimed to be insummountable re. electrification. As I understand it, it is simply a case of 'smart'/'disingenious'/discontinuous electrification being adopted across the Core Valley Lines (CVL) in an effort to limit costs. Caerphilly tunnel is therefore is not expected to be wired and I think there were rumours and/or reports that the battery capacity on the 398s is not sufficient to reliably bridge a gap in the wires that long.
I'm pretty sure that, as part of their winning bid, KeolisAmey promissed 100% electric operation (overhead and battery modes only) on the CVL. The diesel mode was for the Vale Of Glamorgan where there may be at risk of running out of battery.
Yes, I think that (and/or difficultly getting to the tram-train depot at Taffs Well without building new/re-openned lines) is why Coryton is expected to see the rather-superior FLIRTs rather than the tram-trains.
I understand that, unlike the CVL, the other bit of TfW-owned rail infrustructure (Cardiff Queen Street to Cardiff Bay) is to be converted to line-of-sight operation and cease to be a heavy rail route. The FLIRTs will therefore be unable to run to Cardiff Bay and sadly at present the plan is for the Heads Of The Valleys beyond Pontypridd to have through services to Cardiff Bay and therefore they cannot have FLIRTs without remapping the planned through working.
But here in the UK, trains carrying passengers are not allowed to start moving until the doors have already been locked aren't they?
Barry Island is currently 3tph isn't it? If so, the maps published when the franchise details were announced show that the frequency would be 3tph (ie. unchanged). I can't find the original source for the maps in question, but I have found copies of them as linked below:
The latter is a little hard to read, but as far as I can tell it is as louis97 wrote above plus the 3rd train each hour for Barry Island which I think is a shuttle to/from Cardiff Central.