From SBB APP, it is suggested to travel to Andermatt-Goschenen-Cadenazzo-Milano Centrale.
Just wonder does that mean I can only use my STP from Andermatt-Cadenazzo, then book another ticket from Cadenazzo-Milan?
Besides, as I got a STP, do we need to reserve the seat in advance? Just kinda worry there’s no available seats..
Thank you.