Llanigraham
On Moderation
I don't know the Cornish branches well - I've only done one of them (Falmouth) - but I expect these might be further examples of where a properly integrated bus network using the branch as a bus only road would serve things better than the railway.
However, it is edge cases - mostly shortish branch lines - where this might be true. The Conwy Valley would be a further outlier - that would potentially be best replaced with a cycleway with electric buses on the largely uncongested main road as part of a revised "Sherpa'r Wyddfa" network - there is no nice way to cycle those journeys.
Not the St Ives, as there is simply nowhere near the railway station that is adequate for buses. The "Bus Station" at the top of the ramp from the station is only just big enough for 2 buses, who have to turn around there and in doing so often stop the traffic trying to get passed.
And it isn't helped, as one day two weeks ago, when a foreign tourist decided to park his hired Range Rover just by the entrance and apparently didn't understand English (Or Anglo Saxon!)