Amtrak's California Zephyr is silhouetted against the sunrise at Barr Lake in Brighton, Colorado.

The California Zephyr races the sunrise as it heads through open country east of Roggen, Colorado.

The California Zephyr runs through Roggen, Colorado at sunrise, kicking up dirt and debris along the way due to the dry conditions in Colorado.

The California Zephyr runs through Rocky, Colorado as it heads towards Big Ten Curve and the Moffat Tunnel Sub.

UP 2642 (ET44AH) leads an early morning freight through the refineries in Commerce City, Colorado.

BNSF Executive MAC 9709 leads the Beer Train which will take it to Golden, Colorado and the Coors brewing facility.

BNSF Bluebonnet 2854 (GP39-2) leaves the Denver Yard over the South Platte River with a cut of freight cars that will then get sorted.

BNSF 1732 (SD40-2) shuffles cars at the yard in Denver, Colorado.

Here we see the new facility of the Denver Rock Island Railroad after having been relocated from the Stockyards redevelopment area.

UP 9013 (SD70ACe) leaves Denver, Colorado behind and runs between the oil refineries in Commerce City, Colorado on the Greeley Sub.

UP 9013 (SD70ACe) leads a freight past a coal fired power plant in northeast Denver, Colorado.

The bright gold sunrise shows the oil canning effect on the P42DC motors of the California Zephyr at it runs through Fort Morgan, Colorado on the Brush Sub.

BNSF 5624 (AC4400CW) leads a heavy coal train through Spruce, Colorado, passing a helper unit ready to assist trains over the Palmer Divide.

BNSF 5068 (Dash9) outruns storm clouds leading a GEO train through Nixon, Colorado as it heads south on the Joint Line towards Pueblo, Colorado.

The California Zephyr runs through Fort Morgan, Colorado just as the sun rises over the horizon.