Bletchleyite
Veteran Member
Regarding the Conwy Valley, I think implementing an hourly service would be more beneficial all round over the current timetable operated with a 3 car unit.
Additional services wouldn't even need to go all the way, they could operate as Betws-Y-Coed shuttles.
It's not possible to do hourly with the passing loops where it is. I think you could do two hourly clockface only as far as Betws if you didn't serve south of there (but if you wanted to up that using Llanrwst loop it'd be something like a 90-30 split). The best service in the past was I think about a 1h15 frequency? There was a website about it but I can't find it now.
If you could add a second unit, it would probably make most sense to adapt the signalling so you could send one down to Betws and back while the other was on the bottom section, but it would result in an irregular service.
More recently, when it interworked with a Junction-Holyhead stopping service (late 90s) it didn't have a notably higher frequency but the passing loop was used to allow both a morning and evening peak workers' service and the school services to be provided. With a 3 hourly service that isn't presently possible, though it could sort of be done by reducing the frequency by one round trip per day in order to better target the ones left, which I've proposed before on here. In that case you'd definitely want to use a 3 car.
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