There are many "touristy" routes which cost (lots) of extra money, these can be duplicated by take non-special trains; the Glacerier Express is a prime example: with a SP you can duplicate the exact same route, but you would not be riding in trains marked GE.
^I fully agree with that.
I recently travelled Chur-Disentis-Andermatt using regular "Regio" trains.
OK, the train is not branded "Glacier Express"...but you get exactly the same magnificent scenery!