Under storm clouds with sun rays peeking through, UP 8668 (SD70ACe) leads the Grand Junction to Denver train through Plainview, Colorado on the Moffat Tunnel Sub.

BNSF 3127 leading the Hudson Local is a former Burlington Northern GP50.

BNSF 6873 (ES44C4) leads a sand train past Barr Lake on the Brush Sub.

UP 4927 (SD70M) leads the Rocky Mountaineer train through some of the prettiest scenery in the United States, known as South Draw, located between Crescent and Plainview, Colorado.

The blue engine on the right is the Denver Rock Island Railroad's #996, a NW2 that is 86 years young. It was previously painted in a red and yellow scheme.

Amtrak engine #146 (P42DC) leads the California Zephyr through South Draw, Colorado on the Moffat Tunnel Sub.

UP 8668 (SD70ACe) runs past wild sunflowers as it leads the Grand Junction train to Denver, Colorado.

The all-seeing eye at Rocky, Colorado catches UP 8668 (SD70ACe) leading the Grand Junction train to Denver, Colorado at sunrise.

BNSF 9301 (SD70ACe) leads a freight through the scenic turns and tunnels of South Draw, Colorado.

The California Zephyr emerges from Tunnel #1 at Plainview, Colorado as it heads into the Colorado Rocky Mountains.

Amtrak engine #157 (P42DC) exits Tunnel #1 at Plainview, leading the California Zephyr into the Colorado Rocky Mountains.

Hudson Terminal Railway's veteran Alco S1 moves a cut of cars in the yard at Hudson, Colorado.

The crew of the Denver Rock Island Railroad's SW1500 heads to the barn as the chores are done for the day.

A BNSF oil train passes the petroleum refineries in Commerce City as it heads to Denver, Colorado.

BNSF 9183 (SD70ACe) notches up at it leads a freight towards Denver on the Brush Sub, passing the refineries in Commerce City.