The Glazier Express is a luxury Swiss mountain railway, running between Zermatt and St. Moritz. The leisure journey takes around seven and a half hours, travelling across 291 bridges and through 91 tunnels. This scenic journey is very slow, to allow passengers to take in the spectacular scenery on all sides of the train, at any time of the year. The large panoramic windows in each carriage give passengers the sense of being part of the scenery, rather than just looking at it from afar.
To make the most of the Glacier Express journey, you should consider breaking the journey over several days, getting off the train and staying in some of the stopping points on the way. If you don't like the idea of taking multiple days to do the trip, avoid having to do a round-trip by arranging to stay at either end of the route (this will also avoid you having to pay for a return fare - very expensive!).
While the Glacier Express does over some great photo opportunities, poor reflections can hamper your finest photography skills. Make sure you have your camera right up against the glass to avoid this, or better still, don't worry too much about taking photographs, and enjoy the view with your eyes! If you are travelling on a sunny day, you may want to aim for the side of the train away from the sun's glare, as the giant windows can have a warming effect!
Finally, it may be worth considering a regional train, or tourist day-trip route instead of the Glacier Express. These services don't offer the same level of luxury and service as the Glacier Express, but are more affordable.