St. Gallen Forum: 'St'Gallen AB' station ???

thank you very much for your explanation.

and if we take the bus(or train) from St'Gallen back to Appenzell, we must go to St' Gallen AB, do I understand right?. (AB=Appenzeller Bahn).

Yes that's correct there is not a bus service.

Buses in Switzerland feed into rail stations rather than compete on the same routes.

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