Celebrating its 125th anniversary this year, the Rhäetian is, amazingly, not a tourist train. But it is one of only three inscribed on Unesco’s World Heritage List, featuring 84 tunnels as well as 383 spectacular bridges and stone viaducts that cross the landscape’s lacework of glittering rivers and glaciers.
Need I say more...
Here are the links:
The Swiss train tourists don’t take Part 1
The Swiss train tourists don’t take Part 2
I have done this trip many times and I can highly recommend it.