UP 7459 (ES44AC) anchors a string of heavies as they wait for service in the Union Pacific's North Yard in Denver, Colorado.

Light snow and strong winds are greeting the California Zephyr as it runs through Crescent, Colorado on the Moffat Tunnel Sub.

The California Zephyr runs through Coal Creek Canyon, and has a Federal Railroad Administration car in place of the baggage car.

Denver Rock Island Railroad's SW1500 shoves a load of cars into the yard which is across the street from a Colorado National Guard armory.

Heavy snow falls on the Colorado Railroad Museum's Denver Leadville & Gunnison's #191 (2-8-0).

BNSF 4034 (Dash9) crosses through an intersection as it heads towards the BNSF yard in Fort Collins, Colorado.

BNSF 8115 (ES44C4) passes newly-installed power poles as it runs through Castle Rock, Colorado on the Joint Line.

BNSF 8115 (ES44C4) leads a stack train south on the Joint Line through fresh snow at Greenland, Colorado.

a frosty BNSF 7474 (ES44DC) brings a freight through West Tonville as it runs west on the Brush Sub.

BNSF 5163 (Dash9) brings a freight into Broomfield, Colorado, passing a BNSF auto rack train on the siding.

BNSF 9094 (SD70ACe) leads a coal train at sunset through Hudson, Colorado on the Brush Sub.

Denver, like many cities, have a homeless population that take daily risks to access many encampments alongside active tracks.

BNSF 9803 (Grinstein SD70MAC) sits in the yard of the BNSF engine servicing center in Denver, Colorado.

BNSF 9015 (SD70ACe) leads a freight out of the yard in Denver, Colorado.

BNSF 8115 (ES44C4) passes through Castle Rock, Colorado as it heads southbound on the Joint Line.