I came across a set of tours I had not seen before and thought they may be interesting for visitors. 3-7 days round central Switzerland: switzerlandtravelcentre.com/en/che/tours/alpine-tour-grand-train-tour.
Thank you for the interesting link!
More train options and packages can be found here: https://www.myswissalps.com/activities/scenictrips/train and https://www.myswissalps.com/railholidays.
Warm greetings, Sara
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