The summer season has started for the Rhine Gorge (Ruinaulta) 'Erlebniszug' tourist train with fully open to the air carriages:
The other RhB tourist services will be starting up soon for the summer. They are often hauled by historic locomotives.
Did this yesterday to Davos - very worthwhile experience.
All you need to know about traveling by train, bus or car in Switzerland.
Hand picked Swiss hotels and other accommodations are right here.
Swiss Travel Pass promotion: 25% discountAvailable until 11 December 2021. Book 11 months in advance. Free cancellation.https://shop.switzerlandtravelcentre.com/#/en/home.