There's an excellent Canadian TV series called Mighty Trains, in the US it's airing on the Smithsonian Channel (you probably have it on your cable system, you just never looked).
One episode is devoted to the Glacier Express. So it's 40 minutes or so (DVR it) of a professionally produced TV show, with lots of Go-Pros stuck over and under the train, visits to the factory where they make the cog wheel assemblies, aerial footage, lots of tunnel and bridge action. It might be available to view online as well, either free or for rental. If you think you want to take this train, this will answer all your questions (and make you want to buy tickets immediately!) Smithsonian tends to rerun shows almost endlessly so it shouldn't be too hard to find. Their episodes on the trans-Canada train and the Shinkansen are also very good.