We went this morning to the IMAX production of the Rocky Mountain Express. It's the only showing planned for Montreal at the moment and was well worth the visit. The movie, by Stephen Low was a labour of love. He had been a volunteer at Exprail, and the showing was a fund raiser for the movie. It describes the building of the Canadian Pacific Railway through the mountains and the difficulty in selecting a path for the railway. Fantastic aerial photography as well as artsy views from cameras mounted on the locomotive itself.
The trailer for it can be found at: http://www.rockymountainexpressfilm.com/film/trailer/ but if you get a chance to see it in the theatre it's well worth the 45 minutes of your time.