My fictious scenario is 4tph between Cardiff and Swansea, plus an hourly Carmarthen - Cardiff service via the Swansea District Line. The 4tph into Swansea from the east would then be:
- 1tph London - Reading - Newport - Cardiff Central - Bridgend - Port Talbot Parkway - Neath - Swansea (with Intercity 225s, or similar)
- 1tph Manchester - Swansea (diesel - existing service, but calling Bridgend, Port Talbot and Neath only on the section in question)
- 1tph Swansea - Cardiff Swanline EMU service all stations (was going to be to Cheltenham, but I've given up hope of wires to Cheltenham except perhaps from Swindon)
- 1tph Swansea - Bristol EMU semi-fast service (replaces part of Taunton - Cardiff), western extention calls at Bridgend, Pyle, Port Talbot, Neath and Swansea
The Swanline EMU service would have the proposed 2nd Maesteg each hour attached (means we need corriodor-ended units) or the 2nd Maesteg would be diverted via Barry or terminate at Bridgend. Trobble is, once the current Maesteg and my proposed SDL service is factored in there isn't enough paths for that and all the freight without some new 4-tracking or having it spend alot of time in loops. Several posters have suggested that the Swansea - Bristol would be the service to drop (though perhaps they'd extend the Swanline to Bristol instead).
Those are the two big questions, how much of Valleys are DfT indending to electrify? If Bridgend and Maesteg are included, then Swansea has a much stronger case, if IEP is ordered in bi-mode form then electrification, and perhaps eventually the railways and life on earth, is dead. On Wales Today last night they were talking about Tower Coliery, class 92 haulage of coal from Tower to Aberthaw anyone?