I would like to see the daily Carmarthen - London service extended to run to/from Milford Haven like it used to at one time.
So your suggesting:
06:30 from Milford Haven, for 07:30 off Carmarthen, 11:33 Paddington
17:15 off Paddington, 21:30 off Carmarthen and 22:15 into Milford Haven?
Not sure how much extra traffic that would generate over / would it relieve overcrowding on current services:
06:00 from Milford Haven which connects through to 11:07 at Paddington
17:45 (Paddington) which connects through to 22:43
An extra 4 hours running for an
HST▸ each day. Single line issues / Network Rail availabiity / Platform length ... ?? I can think of other more rewarding (I believe) use of 32 carriage hours per day - but if Milford Haven / Haverfordwest councils have a significant business case, perhaps the train just happens to be in the right place at the right time to do it.
The 07:30 off Carmarthen looks to me to be very usefully timed if you start work in Swansea at 9am or have a meeting to attend in Cardiff at 10am (not that I do either of those things, so I may be wrong). However, the evening service doesn't seem to be usefully timed. Personally, I'd much rather see through services from Carmarthen and Pembrokeshire to Paddington ditched than have Hitachi (or anyone) build bi-mode
IEPs▸ , but at least a 6-coach long
LHCS▸ train from Pembs/Carmarthen to Swansea/Cardiff(or Bristol might be useful) would probably be needed to cover for the loss of the capacity provided by the IC125. Regardless, going via Swansea is too slow a way to get from Carmarthen to Cardiff really, it is the capacity that is useful more than the fact it goes to London I would guess.
I suspect the existing Carmarthen service will do well to survive IEP, as would mean positioning a bi-mode set at Swansea on what would otherwise be a completely electric only service from South Wales to London. A possible unfortunate consequence of the wires being continued to Swansea.
Given there's a good through service from West Wales as far as Newport, with reasonable quality of stock, the only passengers benefitting from the HST are those from west of Llanelli travelling into England. I doubt that will be a large number each day. Though politically there may be a bit of a fuss if the connection is lost.
The documents published for the aborted/delayed
GWML▸ franchise competition show the Paddington - Carmarthen service as a service commitment. If I've done my estimates right, the number of 9-car psudo-electric IEP diagrams ordered is not sufficent to run all Bristol, Oxford, Cardiff and Swansea services anyway. If the
DaFT» plans go ahead as they seem to be laid out, there'll be several 5-car bi-mode diagrams entirely under the brand-new wires.
Interestingly, the same document that shows the Paddington-Carmarthen service is a contractual commitment also maintains a commitment for the Pembroke Dock - Paddington summer services (which cannot be worked by IEP as the line beyond Carmarthen is not included on the plans for IEP guage clearance).