Here are some excellent destinations and train services that one must do in Switzerland.
The Swiss Travel System - Scenic Routes
The Swiss Travel System
The Bernina Express
The Glacier Express
The Golden Pass Line
The Romantic Route
The Chocolate Train
The William Tell Express
Mountain Excursions
The Gornergrat
The Matterhorn
The Jungfrau
The Schilthorn
The Pilatus
The Rigi
The Titlis
Cities and resorts
Basel, Bern, Geneva, Gstaad, Interlaken, Lausanne, Lucerne, Lugano, Montreux, Schaffhausen, St. Gallen, St.Moritz, Zermatt and Zurich
Other Attractions
Boat Cruises, Swiss Chocolate Factories, Swiss Miniatur