Thunderstorms have just moved through the North Yard in Denver, Colorado as UP 1212 (GP39-2) works on a cut of cars.

BNSF 9072 (SD70ACe) leads a coal train on the Brush Sub through Tonville, Colorado.

BNSF 3299 (ET44C4) runs past a pond in Keenesburg, Colorado as it runs east on the Brush Sub.

BNSF 3299 (ET44C4) runs through Hudson, Colorado as it runs east on the Brush Sub.

A misty ground fog lays low at sunrise as the California Zephyr runs past a center pivot irrigation system in Wiggins, Colorado.

BNSF 1579 (SD40-2) and mate run light into the refinery district in Commerce City, Colorado.

Amtrak engine #51 (P42DC) gets put into a siding in Fort Morgan, Colorado due to a hot journal, forcing the California Zephyr to run with one engine to Denver.

BNSF 4404 (Dash9) runs through Tunnel #14 as it leads the California Zephyr into South Draw on the Moffat Tunnel Sub.

Rocky Moutaineer's GP40-3 leads the way around the rock formations above Coal Creek Canyon.

Coal Creek Canyon is starting to green up with the spring rains as the Rocky Moutaineer heads into the Colorado Rocky Mountains on their way to Utah.

The Rocky Moutaineer climbs the 2% grade out of Coal Creek Canyon and approaches Tunnel #1 on the Moffat Tunnel Sub.

Hudson Terminal Railroad's #646 (Alco S1) moves a cut of oil cans in the large yard in Hudson, Colorado.

BNSF 9167 (SD70ACe) leads a coal train through a triple signal junction on the Brush Sub.

BNSF 5783 (ES44C4) runs past a cattle ranch in Spruce, Colorado as it heads south on the Joint Line.

BNSF 3171 (GP25) moves a cut of oil cans in the yard in Hudson, Colorado.