On Atos based online booking websites a ticket from/to Llanfairfechan along the North Wales Coast to/from for example Crewe or somewhere in England etc. can be routed via Bangor (Gwynedd) ie. going further and double backing. The Trainline websites don't allow "via Bangor (Gwynedd)". Is there a known rule in the area to go via Bangor?, I can only find the double back at LLandudno Junction Easement rule and I'm not sure it is the right one for this case. Basically I want to buy a Off Peak Day Return from Bangor but one doesn't exist for my trip the nearest is from Llanfairfechan but the chosen train from Bangor doesn't stop there so I would have pay extra to split tickets at LLandudno Junction. I assume I would run into problems walking into Bangor station and asking for a cheaper Llanfairfechan to destination X via Bangor ticket and boarding in Bangor.