The California Zephyr #5 runs through the BNSF yard in Denver before backing into Union Station.

The California Zephyr runs through Fort Morgan, Colorado at sunrise.

UP 7956 (AC45CCTE) leads a Herzog ballast train into the setting sun.

UP 6276 (ES44AC) is framed by the trees at Rocky, Colorado.

UP 8018 (ES44AC) leads a freight out of the fog and through the signals as it enters the large yard in Cheyenne, Wyoming.

UP 6276 (ES44AC) leads an oil can train through Coal Creek Canyon on the Moffat Tunnel Sub.

UP 3974 (SD70M) runs solo back to Denver, passing between the Commerce City refineries on the Greeley Sub.

UP 6276 (ES44AC) leads an oil can train through Tolland, Colorado on the Moffat Tunnel Sub.

BNSF 3839 (ET44C4) has just been serviced with fuel and sand and is ready to head to a waiting train in the Denver Yard.

BNSF 2949 (GP39-2) and mate move a single hopper through Longmont, Colorado.

BNSF 1908 (SD40-2) joins a Warbonnet in the BNSF engine yard in Denver, Colorado.

BNSF 9119 (SD70ACe) climbs the grade between Larkspur and Greenland, Colorado as it runs southbound on the Joint Line.

BNSF 9119 (SD70ACe) runs the S curve at Spruce, Colorado as it heads south on the Joint Line.

BNSF 7069 (ES44C4) leads a Warbonnet and a load of fiber optic cable as it runs through Wiggins, Colorado on the Brush Sub.

Sleet is falling as the Winter Park Express Ski Train heads back to Denver by running though Coal Creek Canyon on the Moffat Tunnel Sub.