UP 8016 (ES44AC) runs through a sunny Leyden, Colorado as it heads to Denver on the Moffat Tunnel Sub.

It is snowing heavily on Christmas Eve as UP 8016 (ES44AC) leads an oil can train down the hill from Tunnel #1 at Plainview, Colorado.

UP 8016 (ES44AC) leads an oil can through heavy snow at Tolland, Colorado as it runs towards Denver on the Moffat Tunnel Sub.

It is Christmas Eve and heavy snow is falling at Pinecliffe, Colorado as the California Zephyr runs into Tunnel 29 on the Moffat Tunnel Sub.

Heavy snow is falling at the east portal of the Moffat Tunnel on Christmas Eve as UP 8016 (ES44AC) exits leading an oil can train destined for Denver, Colorado.

UP 8779 (SD70ACe) leads a manifest train through Pinecliffe on Christmas Eve as the snow falls in the high country.

The California Zephyr runs towards Big Ten Curve and will soon begin climbing towards the Moffat Tunnel.

The morning California Zephyr train out of Denver, Colorado runs through Coal Creek Canyon and will soon start the climb towards the Continental Divide and the Moffat Tunnel.

BNSF light and heavy power are mixed at the engine servicing facility in Denver, Colorado. Some are waiting for servicing, and some are waiting for orders to head to the Denver Yard.

BNSF 2828 (GP39-2M) runs through Longmont, Colorado and heads towards Boulder on the Front Range Sub.

UP 9080 (SD70AH) crosses over Highway 72 in Coal Creek Canyon as it leads an oil can train towards Tunnel #1 at Plainview, Colorado.

UP 9080 (SD70AH) leads a long oil can train around the corner towards Tunnel #1 at Plainview, Colorado.

Canadian Pacific 8654 (ES44AC) heads into the Denver Yard after leaving Provo, Utah the night before.

BNSF 8409 (SD70ACe) leads a KCS unit towards Tunnel #1 at Plainview, Colorado.

BNSF 2828 (GP39-2M) runs with a cut of cars towards the Longmont Depot where it will pick up orders before heading to Broomfield, Colorado.