Amtrak engine #23 leads the Winter Park Express Ski Train through heavy snow at Coal Creek Canyon, Colorado.

UP 8435 (SD70ACe) leads a coal through Plainview, Colorado on its way to Denver.

UP 5567 (AC4400CW-CTE) muscles a freight through Little Ten Curve at Rocky, Colorado.

UP 801 (GP38-2) works the North Yard in Denver, Colorado, sorting various freight cars into the numerous ladders.

BNSF 9017 (SD70ACe) leads a loaded coal train through Greenland, Colorado as it runs south on the Joint Line.

BNSF 6014 (ES44AC) leads a loaded coal train south on the Joint Line through Palmer Lake.

BNSF 9122 (SD70ACe) leads a loaded coal west on the Brush Sub through West Tonville, Colorado.

The California Zephyr 5 train runs over Highway 72 in Coal Creek Canyon and will soon climb the grade to Tunnel #1.

Snow is falling at Pinecliffe, Colorado as the California Zephyr runs west on the Moffat Tunnel Sub.

The California Zephyr and the Winter Park Express Ski Train are parked at Denver's Union Station as heavy snow falls across the Front Range.

The California Zephyr runs through deep snow at Plainview, Colorado as it heads into the Rocky Mountains on the Moffat Tunnel Sub.

BNSF 8348 (ES44C4) busts through a snow drift as it leads a stack train through Sedalia, Colorado on the Joint Line.

BNSF 5282 (Dash9) leads a freight through Sedalia, Colorado during a snowstorm that dropped over two feet of snow in the area.

Snow is falling on the Joint Line as BNSF 5347 shoves a freight towards Sedalia, Colorado.

Light snow is falling as the California Zephyr has exited Tunnel #1 and heads towards the crossing at Plainview, Colorado.