BNSF 5934 (ES44AC) leads the Provo to Denver train through Eisele, Colorado on the Moffat Tunnel Sub.

A gaggle of light power (Geeps and SD40-2s) wait for orders after being serviced at the engine facility in Denver, Colorado.

The California Zephyr runs around the base of Blue Mountain as it heads into Coal Creek Canyon, Colorado on the Moffat Tunnel Sub.

Amtrak engine #157 (P42DC) leads the California Zephyr under the Park Avenue Viaduct while leaving Denver, Colorado.

Light power waits for orders in the Union Pacific's North Yard in Denver, Colorado.

UP 8668 (SD70ACe) leads the Grand Junction to Denver train around the base of Blue Mountain on the Moffat Tunnel Sub.

A golden sunrise catches the California Zephyr as it runs past Barr Lake on the Brush Sub.

Amtrak engine #198 (P42DC) leads the California Zephyr through the North Yard in Denver, Colorado.

BNSF 6873 (ES44C4) runs past Barr Lake as it heads to Denver, Colorado on the Brush Sub.

BNSF 9183 (SD70ACe) leads a freight through Commerce City, Colorado on the Brush Sub.

BNSF 9073 (SD70ACe) sits with other power in the yard of the engine servicing facility.

BNSF 3127 (GP50) leads an oil can train south on the Brush Sub at Barr Lake.

BNSF 5102 (Dash9) leads a stack train south on the Joint Line through Greenland, Colorado.

UP 1359 GP40-2 works the intermodal facility in Denver, Colorado.

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