Light power, including UP 1826 (SD40N) works the North Yard in Denver, Colorado.

UP 6047 (AC4400CW-CTE) leads an oil can train west towards Hot Sulphur Springs, Colorado.

Fog, light snow and freezing sleet greet UP 2556 (ES44ACH) as it runs an oil can train through Utah Junction and past the Union Pacific's North Yard in Denver, Colorado.

UP 2752 (C45AH) runs in the cut after exiting the Hermosa Tunnels in Wyoming.

BNSF 8286 (ES44C4) leads a freight through the S curves right before getting to Palmer Lake, Colorado on the Joint Line.

BNSF 6400 (ES44AC) runs a loaded coal southbound on the Joint Line through Colorado Springs, Colorado.

BNSF 6400 (ES44AC) leads a coal train through a snowy Monument, Colorado on the Joint Line.

The California Zephyr runs through Tunnel 3 at Plainview, Colorado on the Moffat Tunnel Sub.

BNSF 8286 (ES44C4) leads a freight through Spruce, Colorado as it runs southbound on the Joint Line.

BNSF 5695 (AC4400CW) shoves a loaded coal train towards Palmer Ridge on the Joint Line through Greenland, Colorado.

The sunrise is still a few minutes away as Pikes Peak starts to get that alpenglow while BNSF 3664 (ET44ACH) leads a coal train downhill towards Greenland, Colorado.

UP 5758 (ES44AC) runs solo to the North Yard for a stop at the service islands.

UP 6417 (AC4400CW) runs over a bridge in Castle Rock, Colorado as it heads south with a military train on the Joint Line.

Snow is falling fast as UP 6417 (AC4400CW) leads a freight into the Union Pacific yard in Cheyenne, Wyoming, just as another freight heads out.

Amtrak engine #192 (P42DC) leads the California Zephyr through Gore Canyon, Colorado.