While the fastest route from Zurich to Zermatt takes about 3 hours and goes through the deep Lötschberg Base Tunnel, the most scenic route is the "Mountain Route" via the Lötschberg Mountain Railway, which takes about 6 to 7 hours. Instead of going under the mountains, this train takes you over the historic mountain pass through Kandersteg, offering spectacular views of the Swiss Alps and the Rhone Valley from high bridges. Another incredibly scenic (but longer) option in 2026 is to take a train from Zurich to Chur, then board the world-famous Glacier Express for the final leg to Zermatt. This "Slowest Express Train in the World" features panoramic glass ceilings, allowing you to see the towering peaks and deep gorges of the Oberalp Pass in full detail. If you have the time, the Glacier Express connection is the ultimate 2026 Swiss rail experience, though it requires a separate seat reservation and a significantly larger time commitment.