UP 5725 (AC4400CW-CTE) leads an oil can train towards the east portal of the Moffat Tunnel in a driving snowstorm.

Amtrak engineers Gary Meyer and Justin Anton pose in front of UP 5518 as they get ready to have a crew swap after bringing the California Zephyr down the Moffat Tunnel Sub. A Union Pacific motor ... (more)

Long shadows from a bright sunrise surround UP 1502 (GP40M-2) as it moves a cut of cars in the Union Pacific's North Yard in Denver, Coloradol

Amtrak engine #135 (P42DC) runs through Levy, New Mexico leading the Southwest Chief.

BNSF 2719 (GP39-2) gets ready to leave the Pueblo Yard with a local train.

BNSF 6307 (ES44C4) moves into the BNSF yard in Pueblo, Colorado.

UP 1957 (SD40N) sorts cars in the Union Pacific's North Yard in Denver, Colorado.

The sunrise glints off the ribbons of steel as a BNSF ACe pulls an empty coal into the yard at Pueblo, Colorado.

The dust flies as a hot sunrise provides an orange glow against the California Zephyr as it runs through Keenesburg, Colorado on the Brush Sub.

UP 801 (GP38-2) waits for the call to action to sort cars in the Union Pacific's North Yard in Denver, Colorado.

UP 688 (GP38-2) strains to pull a cut of cars out of the North Yard for sorting.

A Union Pacific and a Kansas City Southern motor visit the BNSF engine servicing facility in Denver, Colorado.

BNSF 9299 (SD70ACe) muscles a loaded coal train through Wiggins on the Brush Sub towards Roggen, Colorado.

The operations building in the Union Pacific's North Yard in Denver, Colorado has a commanding view of the massive yard.

A smartly painted J.R. Simplot Company's SW1000 crosses a road in Brighton, Colorado as it heads north on the Greeley Sub.