Cheryl Imboden has written a very comprehensive article on this subject. You can find it at:

http://goswitzerland.about.com/travel/europe/goswitzerland/library/weekly/aa981228.htm?IAM=DOGPILE&rf=dp&COB=home

We wrote about our trip on most of that route (not on a Glacier Express train) in our Switzerland 1996 travelogue. You may wish to check it out at http://www.thetravelzine.com.

Regards, Don&Linda