A train ride across the Alps is always wonderful. I did a shorter version of the journey from Chur to St. Moritz and St. Moritz to Tirano. Both of them was the most scenic rail journey I did, though it was part of a ski trip so I did it in winter, with a different scenery. It was so good, I did a repeat of the St. Moritz to Tirano journey by car in summer while with family.