The California Zephyr runs through the signals at Crescent, Colorado.

UP 8009 (ES44AC) is about to disappear into thick fog at Blue Mountain, Colorado.

UP 7104 (AC4400CW) leads an oil train down the hill from Tunnel #1 at Plainview, Colorado.

Storm clouds are dropping snow in the Rocky Mountains as UP 2698 (AC4400CW) runs through Leyden, Colorado on its way to Denver.

The BNSF Local to Hudson Colorado makes its run back to Denver as the last licks of sunset light highlight the clean orange paint on both motors.

BNSF 6407 (ES44C4) muscles a loaded coal train through Monument, Colorado.

BNSF 9122 (SD70ACe) runs a loaded coal train past the refineries in Commerce City, Colorado.

The California Zephyr 6 train runs through Rollinsville, Colorado at sunset, which is casting a glinty glow on the side of the stainless steel cars.

The California Zephyr rounds the base of Blue Mountain as it heads into the Colorado Rocky Mountains on the Moffat Tunnel Sub.

Heavy snow has fallen at Crescent, Colorado as the Winter Park Express runs west on the Moffat Tunnel Sub.

The Royal Gorge, D&RGW train 1, is departing Denver Colorado in 1953. Otto Conrad Perry photo, from my collection.

D&RGW F7 5594 and mates lead a 92 car westbound freight near Palmer Lake Colorado on October 20th 1950. Otto Conrad Perry photo, from my collection.

Snow is falling as DRGW 3011 (GP30) and a Galloping Goose hold sidings at the Colorado Railroad Museum.

Snow is falling as BNSF 5874 (ES44AC) joins a Warbonnet, a Norfolk Southern Pony and an Executive Grinstein while they wait for service at the engine facility in Denver, Colorado.

Sunrise catches BNSF 5973 (ES44AC) leading a long freight with heavy power through Tunnel #1 at Plainview, Colorado.