The California Zephyr is framed by mother nature as it heads through a snowstorm at Rocky, Colorado on the way to Denver.

UP 6419 (AC4400) shoves a loaded coal train through Little 10 Curve at Rocky, Colorado and will soon arrive in Denver, whose skyline can be seen in the distance.

UP 7765 (ES44AC) rounds the Big Ten Curve as the City of Denver skyline simmers in the background.

Amtrak engine 175 (P42DC) leads the California Zephyr through Big Ten Curve at Rocky, Colorado.

The California Zephyr runs through the cut between the trees leading to Rocky, Colorado.

Amtrak engine #137 (P42DC) leads the California Zephry through Rocky, Colorado on its way to the Moffat Tunnel.

The California Zephyr rousts the birds out of the trees as it runs under Highway 93 as it approaches Rocky, Colorado.

UP 8417 (SD70ACe) leads a mega coal train which is long enough to start at the Rocky siding and extend through Little Ten Curve.

Missouri Pacific Heritage UP 1982 (SD70ACe) enters the cut after running through Rocky, Colorado on its way to Denver.

UP 8850 (SD70AH) leads a long freight around Big Ten Curve as it drops in elevation on the Moffat Tunnel Sub at Rocky, Colorado.

Amtrak engine 71 (P42DC) runs through Big Ten Curve as it heads towards the Moffat Tunnel district and the Colorado Rocky Mountains.

Fog and light snow envelope the California Zephyr as it runs through Rocky Colorado on its way to the Moffat Tunnel.

The California Zephyr meets a BNSF freight at the Rocky Siding before heading into Little Ten and Big Ten curves.

Amtrak engine 142 (P42DC) rounds the Big Ten Curve as it climbs the 2% grade towards Eisele, Colorado.

The California Zephyr meets a BNSF Coal train at Rocky, Colorado as it runs west on the Moffat Tunnel Sub.