I Just saw this one on TCM as well. The Durango depot is re-named Aztec for the filming. When the 315 leaves the depot, you can see the back of the Durango roundhouse as the camera pans with the train. It also looks like they did an insert shot with one of the combines. You see Joel McRea on the end of the train and you see the D&RGW gold letters below the car windows. The lettering disappears in the next shots. It was also strange to notice that the production company placed some black paper or sticker over the 3 of the 315 painted on the cab. They re-lettered the tender, but made very little effort to fix the cab number as she portrayed #15.