Switzerland’s “window to the Alps” takes you from St. Moritz to Zermatt through 180 miles of mountains, valleys, and charming villages, crossing 291 bridges and 91 tunnels along the way. Every seat offers incredible views, and Excellence Class adds a private bar, concierge service, and a five-course menu with wine pairings. Before you book, there are a few things you really should know to make the most of your trip—here are 5 tips to help you decide. To learn more about this train and other luxu