From November or from 2025? Sorry my post was referring to from this November.
Rhymney is
due an increase to 2tph from June this year, but one of those trains will be limited-stop. The June timetable change is based around existing rolling stock that's available to TfW, so the introduction of new trains simply means that units get substituted rather than being used to run additional services (this is also good risk management, as it means that new trains being introduced can be substituted with others if there are teething problems).
The casacde of stock being talked about here is:
- 756s come in on Treherbert, Aberdare and Merthyr at some unspecified date (but likely to be after the timetable change in June)
- This releases 150s for the Rhymney line services
- This releases 231s to go somewhere else (possibly Maesteg - Ebbw Vale or Cardiff-Cheltenham)
Then, at some point (most likely after November 2024)
-398s come in on Treherbert, Aberdare and Merthyr
- this releases 756s for use on Coryton-Penarth and Caerphilly - Penarth
- some 150s probably go elsewhere (quite possibly on a one-way trip to Newport Docks to be scrapped)
What we don't know (because the timetable consultation from the June timetable only relates to the Core Valley lines - the Welsh-Government-owned lines north of Cardiff) is exactly what'll happen with Vale of Glamorgan trains (i.e. Barry Island and Bridgend via Barry trains) from June.
Michael Fox's map suggests that trains will run Rhymney - Barry Island, Bargoed-Bridgend and Bargoed-Barry Island. However, I suspect his map is purely based on informed speculation rather than hard data.