From Zürich to Chur, over the Julierpass to Silvaplana, St. Moritz, Pontresina
To get to Chur you need to take SBB (Schweizerischen Bundesbahn). From Chur you can travel with RhB (Rhätische Bahn) through the Kehrtunnels and over the speedy Viadukte.
For a more pleasant journey book the Fly-Gepäck-Service in advance.
The 400km journey from Zurich to Pontresina takes approximately 4 hours.