This one stars Randolph Scott as a railroad man who is put into service to find a route for the Canadian Pacific Railway westward. Although the film is pretty loose with the facts, it does present some terrific early color footage (especially with the recent restoration) of steam trains in action. 

Opening shots feature a variety of steam trains at work in the Canadian Rockies around Calgary. We see CPR #'s 5923, 5926 & 5927 (all 2-10-4 "Selkirks" built in 1938), CPR #5809 (a 2-10-2 "Santa Fe") and CPR #5363 (a 2-9-2 "Mikado" from 1926). Unfortunately, none of these locomotives survive, however two later-model Selkirks remain: #5935 at the Canadian Railway Museum in Quebec and #5931 at Heritage Park in Calgary. 

The shot of #5927 paralleling the lake is Wapta Lake, located just off the Trans-Canada Highway. 

There is one particularly epic P.O.V. shot of a train emerging from a tunnel and looking up at a giant mountain peak. This is the Lower Spiral Tunnel at Kicking Horse Pass, looking up at Mt. Stephen - very near the border of British Columbia and Alberta. There is a scenic pulloff on the Trans-Canada Highway that allows views of this still-active rail line with information about the engineering feat. 

GPS Coordinates: 51.435778, -116.404167

As we get into the story, we see footage of a track crew putting down their work and walking away from a work train. This CPR 4-4-0 locomotive (marked #30 here, but you can see where they painted over the "8" because it will appear as #80 later) was used extensively in the filming but I can't seem to find definitive information about which one was used. 

Our introduction to Tom (Scott) features him surveying the wilderness of Yoho National Park in British Columbia. Here he is at Takakkaw Falls. 

The track crew at work with CPR #30 helping out. Many of these shots would be stolen for Kansas Pacific.

More shots of the track crew, as a saboteur dynamites the tracks. 

CPR #30 is now #80 with a different consist. 

Some great shots of #30 backing CPR #409 "Hospital Car" into the railroad camp. 

Now I am a little confused because in Larry Jensen's "Hollywood Railroads" book he cites that Virginia & Truckee #25 was used for the production, and even includes a photo of Jane Wyatt standing on what is clearly #25 with a #30 faceplate. However, I haven't been able to positively identify which shots it was used. My only guess would be these closeup shots of Tom talking to the engineer prior to pulling down the saloon tent. To the right is a photo I took of #25 in 2021 for comparison. 

The film culminates in a final standoff at the hospital car at the end-of-line, where they are attacked by waves of Native Americans. 

However the workers are soon relieved by a wave of reinforcements brought by CPR #80. Tunnel Mountain in Banff can clearly be seen as the train arrives. 

CPR #80 loads up and heads out but Tom has a last-minute change of heart. This location is one possibility for the "wye" seen in these final scenes:

GPS Coordinates: 51.187139, -115.566417

The final scene shows Tom and Cecille (Nancy Olson) living their best life at Lake Louise.