Snow is falling at Denver's Union Station as RTD commuter train #4002 (Hyundai Eagle P3) passes the Winter Park Express Ski Train and heads for Arvada, Colorado.

Amtrak's Winter Park Express Ski Train runs through four feet of snow at Crescent Colorado as it heads up the Moffat Tunnel Sub.

Four feet of snow has fallen at Crescent, Colorado as a pair of Norfolk Southern ponies shove a loaded oil can train towards Denver on the Moffat Tunnel Sub.

UPY 625 (GP15-1) sports a shark mouth on the pilot as it works sorting cars in the North Yard in Denver, Colorado.

UP 8009 (ES44AC) muscles an oil can train through dense fog at Coal Creek Canyon, Colorado.

UP 8147 (ES44AC) leads a coal train through a snow-packed Coal Creek Canyon, Colorado on the Moffat Tunnel Sub.

UP 6825 (ES44AC) runs through dense fog at Coal Creek Canyon, Colorado on the Moffat Tunnel Sub.

UP 6825 (ES44AC) leads a freight south on the Moffat Tunnel Sub through Leyden, Colorado.

UP 2698 (ES44AC) runs south through Leyden, Colorado on the Moffat Tunnel Sub.

UP 6603 (AC4400CW) shoves a loaded oil can train through Plainview, Colorado on the Moffat Tunnel Sub.

Coors Brewery's SW1001 moves a cut of special grain hoppers towards the massive facility in Golden, Colorado.

The California Zephyr runs through a dynamic sunrise at Keenesburg, Colorado.

The California Zephyr is led by engine #82 in the recently applied Phase VII paint scheme. Here it runs over Highway 72 in Coal Creek Canyon, Colorado.

BNSF 8348 (SD70ACe) emerges like a ghost out of heavy snow and leads a stack train north on the Joint Line towards Denver, Colorado.

The BNSF yard in Denver is often home to some vintage SD40-2 motors, including on this day #1933, which was built in 1979 and still represents the Cascade Green fallen flag of the Burlington North... (more)