Interesting discussion on whether Dyfi Junction should be an interchange point. Depends on whether passengers are guaranteed somewhere to wait – if there is a train in the station awaiting connections, then there will also be staff on hand for any emergencies that arise, and a vehicle available for immediate rescue to the nearest road access point e.g. to get to an ambulance.
So, if it is arranged that a train ex Pwllheli arrives, awaits connections on the mainline in both directions, then departs back to Pwllheli, I don’t see any problem. No need for anyone to remain on the station after all three directions have been served.
If the current coast service pattern is maintained (every two hours passing at Tywyn and Harlech), then coast line trains would be sitting at Dovey Junction
for a little over an hour between services, arriving by my calculations just before the two mainline trains do.
Therefore the train would be sitting there whilst the first two mainline trains cross at Dovey and the second two mainline trains cross there also. Therefore there would be somewhere to wait if necessary - on the train!
They could then of course follow the mainline service to Machynlleth and return ahead of the next down service.
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I still find this obsession with having "facilities" and staff at the station somewhat bemusing.
Why would they be necessary if all of the trains are there simultaneously?
If there's an issue with a train running particularly late - then surely the on-board staff would advise passengers to remain on board and alight at Machynlleth? The coast line service having an hour to spare could continue into Machynlleth if necessary.
To again put this in perspective, Manulla Junction on the Dublin/Westport line in Ireland is an Intercity station that is solely used as a passenger changeover point between trains between Dublin and Westport and the branch line service to/from Ballina.
It was staffed from 1988 until 2007, when there was a portakabin signal box on the platform, but has been unstaffed ever since. It has no direct public access other than as a changeover point, and yet up to ten times a day trains connect here and people switch over from one to the other without an issue.
The station is even more basic than Dovey Junction (see photo
here), with absolutely no facilities other than lights and it has worked perfectly.
I really think some people try to make railway operation far more complicated than it needs to be, for purely spurious reasons.