The California Zephyr tries to outrun thunderstorms as it heads east on the Moffat Tunnel Sub through Crescent, Colorado.

BNSF 5689 (AC4400CW) leads a 9-motor oil can train through Tolland, Colorado as it heads west on the Moffat Tunnel Sub.

A power-heavy BNSF train with 9 motors runs through the North Yard as it heads west on the Moffat Tunnel Sub.

Denver Rock Island Railroad's #1083 (SW1500) crosses a street in Denver, Colorado.

Denver Rock Island Railroad's SW1500 runs a gondola through the Stockyards area in Denver, Colorado.

CN 3321 (AC44C6M) pulls alongside a BNSF ACe in Hillrose, Colorado.

Amtrak engine #157 (P42DC) runs through the BNSF yard in Denver, Colorado, after which it will back into Denver's Union Station.

This gloss black veteran was built in 1953 as a GP7, and was rebuilt into a GP10, working now for the Chattahoochee Locomotive company.

A glowing Wyoming sunrise catches UP 6078 (AC4400CW-CTE) leading a freight away from Archer Hill east of Cheyenne.

UP 5830 (ES44AC) leads a freight past the windmills west of Cheyenne, Wyoming.

UP 5830 (ES44AC) leads a freight past its reflection at Granite, Wyoming on its way to Cheyenne.

Rocky Mountaineer's 8021 (GP40-3) leads the passenger train through Tunnel #15 in South Draw, Colorado as it heads to Denver on the Moffat Tunnel Sub.

BNSF 8591 (SD70ACe) greets the first rays of sunrise as it leads an empty coal north through Greenland on the Joint Line.

BNSF 5696 (AC4400CW) leads a loaded coal train through Keenesburg, Colorado as it heads west on the Brush Sub towards Denver.

BNSF 8998 (SD70ACe) runs through the North Yard in Denver as it leads a freight toward Golden, Colorado.