I am planning to go to either Zurich or Interlaken using the folliwng train roUtes (with swiss pass)
a)Take Bernina from Tirano to Chur to Zurich(reach aroud 6:00pm). covered under swiss pass
b) Take train (I guess Glacier express) from Tirano to St moritz to Lucerne. covered under swiss pass
c) Take train from Milano to Brig to Spiez. Not sure if its covered under swiss pass. Please confirm
Also, which one would be the best route. I would probably take the regional trains, without any reservation , as I like open window trains better then closed panoramic ones.