The California Zephyr 6 train runs through Plainview, Colorado and heads towards Tunnel #1 and Coal Creek Canyon on its way to Denver.

S&S Shortline Leasing #1393 (MP15AC) moves a cut of grain cars at the Budweiser Brewery in Fort Collins, Colorado.

With the City of Denver skyline on the horizon and wildflowers in bloom in Coal Creek Canyon, UP 6271 (ES44AC) shoves an oil can towards Tunnel #1 on the Moffat Tunnel Sub.

BNSF 8424 (SD70ACe) runs light with a mate through Greenland, Colorado on the Joint Line.

BNSF 8400 (SD70ACe) leads a coal train towards Hudson, Colorado as it runs west on the Brush Sub.

BNSF 7678 (ES44DC) leads a freight past the silos at Roggen, Colorado.

BNSF 4019 (Dash9) leads a warbonnet and a grain train through Keenesburg, Colorado.

Amtrak's Winter Park Express Ski Train kicks up the snow as it runs through Arvada, Colorado on the Moffat Tunnel Sub.

RTD commuter train #4128 (Hyundai Eagle P3) takes the elevated track over the California Zephyr, which is arriving at the Denver Yard prior to backing into Denver Union Station.

BNSF 5866 (ES44AC) runs through Tunnel #29 at Pinecliffe, Colorado as it heads towards Denver on the Moffat Tunnel Sub.

BNSF 3014 (GP40-2) sits in the engine serving yard along with a GP39 and the red caboose and white cars of the BNSF fire train.

UP 1957 (SD40N) works the North Yard in Denver, Colorado.

Here is a good look at DODX 39497, the Department of Defense's nuke cask heavyweight flatcar designed to carry spent nuclear fuel rods. It stopped by the yard in Denver for a few days.

BNSF 7678 (ES44DC) runs through the Keenesburg Cut and heads downhill as it runs towards Hudson, Colorado on the Brush Sub.

BNSF 7678 (ES44DC) leads a mixed freight through Roggen, Colorado as it heads to Denver on the Brush Sub.