Above: The Glacier Express passing Celerina, near St. Moritz

Part of my trip aroundSwitzerlandwas aboard one of the world’s most famous trains, theGlacier Express. The service began in 1930, and the narrow-gauge line between St. Moritz and Zermatt goes through 91 tunnels and crosses 291 bridges, including the extraordinary 213-foot high Landwasser Viaduct. Long sections use a rack-and-pinion system for ascending and descending the gradients. Often, the train can only proceed in spirals. The highest point of the trip is the 6,706-foot Oberalp Pass. Although the journey is a distance of less than 200 miles, it takes 8½ hours.

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