NFB video! This one is titled Trans Canada Express, and it documents the important contributions Canada's railways made for the war effort during World War 2.
The 1944 film also gives us a brief history of the making of the Canadian Pacific rail line through the Rockies (complete with a poem), some classic clips from Buster Keaton's "The General", and a rousing finale that takes us from coast to coast (complete with a song)!
Best of all, this 19 minute video gives us some great views of railroading in the 1940's when steam was king, and some breathtaking views of Canada's scenery (albeit in black and white). To view Trans Canada Express, click here.