We took a Golden Pass Panorama train from Geneva to Interlaken and the view was breath taking. The Train was designed to enjoy the beautiful scenery of Switzerland.
We booked 2 months ahead and upgraded from 2nd to 1st class with additional fee.
It is highly recommended if you have plan to move from Geneva to Interlaken and also should be booked in advance due to a lot of travelers and lack of seats.
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