UP 845 (GP38-2) works an industrial yard in Commerce City, Colorado.

The last seconds of sunset light catches BNSF 6427 (ES44AC) leading a coal train through the refineries in Commerce City, Colorado.

Union Pacific Big Boy #4014 leaves the Denver skyline behind as it heads towards Commerce City on the way back to home base in Cheyenne, Wyoming.

A bike rider is about to get a touch of steam as the Union Pacific's Big Boy #4014 crosses a bridge in Commerce City, Colorado, home of a number of oil refineries.

UP 688 (GP38-2) works a yard in Commerce City, Colorado, waiting for the signal to grab a cut of gondolas from a nearby scrap metal business.

BNSF 6826 (ES44C4) leads a freight past the refineries in Commerce City, Colorado.

BNSF 1899 (SD40-2) leads an oil can train past the refineries in Commerce City, Colorado.

BNSF 6274 (ES44AC) leads a stack train past amber waves of wild grasses that are trackside in Commerce City, Colorado.

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

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.

BNSF 1899 (SD40-2) heads to Denver on the Brush Sub, passing through Commerce City on the way.

BNSF 5873 (ES44AC) leads auto racks past the refineries at Commerce City, Colorado.

The California Zephyr 6 train was over 11 hours late leaving Denver, Colorado, affording the rare shot of the 6 running through the Commerce City petroleum refineries at sunrise.

BNSF ACe 8571 runs towards Denver on the Brush Sub through Commerce City, Colorado.