The locomotives and rolling stock seen in the film were all built in a machine shop in Sun Valley, California. One of the two locomotives, a 4-6-0 or Ten-wheeler, was used in the beginning of the film and then was renovated into the "Constitution" locomotive seen later in the film. The other locomotive, a 4-4-0 or American, was based on the Central Pacific Jupiter that was on hand for the real Golden Spike Ceremony up on Promontory Point. For easy movement, the locomotives and rail cars were built in the same fashion as shipping containers so they could be added and removed from their chassis and then transported on flatbed trucks. This method was also used in part of the train chase scene that took place in the mountains since they could not build any railroad tracks up in the mountains.

Film

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