Glacier Express

The Glacier Express is an express train connecting railway stations of the two major mountain resorts of Zermatt and St. Moritz in the center of the Swiss Alps. The train is not an "express" in the sense of being a high-speed train, but rather, in the sense that it provides a one-seat ride for an eight-hours-long journey, and omits stops made by local trains. The Glacier Express is known as the slowest express train in the world. As St. Moritz and Zermatt are home to two well-known mountains, the Glacier Express is also said to travel from Matterhorn to Piz Bernina.
The journey from Zermatt starts at the dead end of a Alpine valley, the Mattertal, just below the world-renowned Matterhorn at an elevation of 1,606 m before it descends to the huge valley of the Valais in Brig. It traverses the 291-kilometre-long journey through the center of the Swiss Alps, over 291 bridges, through 91 tunnels, such as the 15.4 km-long Furka Tunnel at an elevation of 1,500 m to circumvent the Furka Pass, makes an intermediate stop at Andermatt on a secluded high Alpine valley, just to traverse its highest point on the Oberalp Pass at 2,033 m in order to descend to its lowest point at Chur at 585 m . From Chur, the capital of the canton of Graubünden, the GEX backtracks to higher altitudes again in order to reach the resort St. Moritz in a further valley to the south. Previously, before traversing the Albula Range by a tunnel at 1,800 metres , in Filisur travelers can change to a connecting train to reach Davos to the east.

Wikipedia