Denver & Rio Grande 10-wheeler #168 charges up the section of track known as "The Whiplash" (MP 296.8), heading west on the San Juan Extension toward Durango, CO via Cumbres Pass. The Whiplash is a series of reverse curves which allow the train to gain roughly 200 ft. of elevation over a very short distance. As seen in this frame, the train is about to enter the last of the reverse curves, which will take it toward Big Horn Station, about 3 miles ahead. The mountain visible on the right side of the image is Big Horn Peak (elevation 9,442 ft.), which lies just to the south of the little yard and wye at Big Horn Station.
This image was captured during an October 2024 photo shoot on the Cumbres & Toltec Scenic Railroad, which featured Locomotive #168, one of only 2 survivors of the D&RG T-12 Class, and the only survivor that is operable today.