The last minutes of sun at sunset catches UPY 625 (GP15-1) running through the Union Pacific's North Yard with a unique tiger mouth painted on the pilot.
UP 7739 (ES44AC) passes under the signal tower after leaving the North Yard in Denver, Colorado.
The Amtrak Winter Park Express Ski Train leaves downtown Denver at sunrise and heads towards the Rocky Mountains on the Moffat Tunnel Sub.
Heavy snow falls on the Union Pacific's North Yard, catching UP 1357 (GP40-2) as it moves a cut of cars for sorting.
Heavy snow falls on the BNSF's Denver Yard as engine #1733 (SD40-2) pulls a cut of cars for sorting.
The Blue Hour falls along the Colorado Front Range as the California Zephyr 6 train approaches the North Yard in Denver, Colorado.
The California Zephyr leaves the North Yard in Denver, Colorado as heavy snow falls across the Front Range.
RTD commuter train #4057 (Hyundai Eagle P3) runs past the yard of the BNSF engine servicing facility in Denver, Colorado.
BNSF 7791 (ES44C4) joins other heavies in the yard of the engine servicing facility as heavy snow falls over downtown Denver, Colorado.
BNSF 1822 (SD40-2) heads over the South Platte River as it leaves that large yard in downtown Denver, Colorado.
UP 1865 and UP 1817 sit at the busy diesel service area, waiting for their next switching assignment, in the Union Pacific North yard.
Inside the cab of Union Pacific Big Boy 4005, which is on display at the Forney Museum of Transportation.
A RTD Commuter train heading to DIA passes a yard full of BNSF heavy motors waiting for assignments or service in Denver, Colorado.
BNSF 8918 (SD70MAC) join other heavies waiting in the yard of the engine servicing facility in Denver, Colorado.
BNSF 1822 (SD40-2) sorts a cut of cars into the massive yard in Denver, Colorado.
