The California Zephyr backs into a foggy Denver Union Station after passing through the BNSF engine servicing facility.

BNSF Grinstein 9604 (SD70MAC) shoves an empty coal train into the sunrise at Roggen, Colorado.

BNSF 3127 GP50 runs light as it enters the Keensburg Cut on the Brush Sub.

AMTK 7 (P42DC) leads the California Zephyr through Keenesburg, Colorado on the Brush Sub.

AMTK 142 (P42DC) busts a snow drift as it heads towards the Moffat Tunnel at Tolland, Colorado.

Denver Rock Island Railroad's SW1500 shoves a load of gondolas north as a tractor moves a load of oil cans into the yard.

Denver Rock Island Railroad's SW1500 crosses Packinghouse Road to shove a load of gondolas to a client.

Denver Rock Island Railroad's SW1500 crosses the South Platte River in Denver, Colorado.

Denver Rock Island Railroad's #1083 (SW1500) shares the busy road as it moves a cut of gondolas to a client in Denver, Colorado.

UP 4999 (SD70M) has just been serviced and now parks on the ready track until orders come through.

The California Zephyr whips up the snow at is runs through the trees at Brighton, Colorado.

BNSF 1899 (SD40-2) lashes up to a container train which it will take to the ready track and stage for the Z train.

BNSF 1899 (SD40-2) runs light towards the BNSF intermodal facility in Denver, Colorado where it will stage a container train.

A smile and a wave greet the photographer as the California Zephyr backs into Denver's Union Station.

Heavy snow gets whipped up by the California Zephyr as it heads towards Fort Morgan, Colorado on the Brush Sub.