The Lethbridge Viaduct is a beautiful steel trestle structure built by the Canadian Pacific 1907-1909. The viaduct is over a mile long, largest of its type in the world. In researching info about the viaduct, I came across this video of a fan trip in 2008 pulled by CP 2816 and featuring restored Hiawatha cars. The steam train going over the viaduct helps you to appreciate the massiveness of the structure. I recommend watching it fullscreen.
Bob
Link to view full screen