UP 8016 (ES44AC) splits the signals after exiting the east portal of the Moffat Tunnel and runs into heavy snow falling on the east side of the Continental Divide.

Heavy snow is falling at Tolland, Colorado as UP 8016 (ES44AC) leads an oil can on the Moffat Tunnel Sub.

Amtrak engine #172 (P42DC) leads the California Zephyr over the bridge spanning Highway 72 in Coal Creek Canyon, Colorado.

BNSF 5321 (Dash9) gets ready to move a cut of sand cars out of an industrial complex at Windsor, Colorado.

OmniTRAX #4013 (GP40-2LW) sits on a track in Windsor, Colorado.

UP 9080 (SD70AH) has just run through Coal Creek Canyon and leads a freight up the grade towards Tunnel #1 at Plainview, Colorado.

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.