An eclectic group of BNSF motors, including a Warbonnet, 2 Grinstein MACs and three pumpkins leave the yard in Denver, Colorado.

BNSF 5822 (ES44AC) leads an oil can train towards Pinecliffe, Colorado on the Moffat Tunnel Sub.

BNSF 1660 (SD40-2) and BN mate work the BNSF yard in Denver, Colorado.

BNSF 6274 (ES44AC) stops on the siding in Broomfield, Colorado to change crew members, who will then continue the journey to Denver, Colorado.

BNSF 6274 (ES44AC) leads the LauDen train through the Broomfield Siding as it gets ready to stop for a crew change before proceeding to Denver.

BNSF 6274 (ES44AC) leads a freight south on the Front Range Sub towards Broomfield, Colorado.

An orange sunset falls over the California Zephyr #6 train as it runs through Crescent on the Moffat Tunnel sub towards Denver, Colorado.

Snow is falling as the California Zephyr runs through Chemical, Colorado as it heads west on the Moffat Tunnel Sub.

The California Zephyr runs through a snowy Coal Creek Canyon as it heads west on the Moffat Tunnel Sub.

The conductor of BNSF 6274 (ES44AC) gets out to throw a switch for the siding in Broomfield, Colorado as the train heads south on the Front Range Sub.

BNSF 6274 (ES44AC) leads the Laurel, Montan to Denver train on the Front Range Sub through Broomfield, Colorado.

UP 8112 (ES44AH) runs over the Rio Grande bridge in Monument, Colorado.

UP 5527 (ES44AC) is joined by two BNSF units as they wait for a joint assignment in the Union Pacific's North Yard in Denver, Colorado.

Sunrise catches Union Pacific's Big Boy #4014 (4-8-8-4) as it gets ready to leave Sharon Springs, Wyoming for Denver, Colorado on the old Kansas Pacific line.

RTD commuter train #4029 (Hyundai Eagle P3) drops down from the elevated track spanning the yard of the BSNF engine servicing facility in Denver, Colorado.