UP 6657 (AC4400CW) runs through heavy snow on the Moffat Tunnel Sub as it heads towards Rollinsville, Colorado.

A spring storm is dropping a foot of wet snow on the Moffat Tunnel Sub as UP 6657 (AC4400CW) runs through Rollinsville, Colorado.

Heavy snow from a spring storm is falling on the Moffat Tunnel Sub as UP 6657 (AC4400CW) runs through Tolland, Colorado.

Wet, heavy snow from a spring storm is falling on the Moffat Tunnel Sub as UP 6657 (AC4400CW) runs towards Pinecliffe, Colorado while leading a loaded coal train for Denver.

UP 6657 (AC4400CW) runs past South Boulder Creek as it heads towards Rollinsville, Colorado in heavy snow on the Moffat Tunnel Sub.

A winged UP 6657 (AC4400CW) leads a loaded coal train in heavy snow through the signals at Rollinsville, Colorado as it heads down the mountain towards Denver.

The California Zephyr was three hours late getting into Denver this morning due to the tornadoes in Nebraska, and then the crew and passengers had to deal with heavy snow as they ran into the Colo... (more)

Heavy snow is falling as the California Zephyr runs past the signals at west Pinecliffe, Colorado as it heads higher into the Colorado Rocky Mountains.

A Union Pacific officer's special gets the green to enter the east portal of the Moffat Tunnel at Tolland, Colorado.

UP 4533 (SD70M) leads an officer's special towards the Moffat Tunnel, passing the trusty designated chase vehicle dubbed "The F-Unit".

BNSF 2749 (GP39E) shoves a light motor run towards Lyons, Colorado where the crew will lash up to a small cut of empty hoppers to take back to Longmont.

BNSF 2749 (GP39E) sits at the Longmont Depot with the crew getting ready to head to the cement plant at Lyons, Colorado.

BNSF 8529 (SD70ACe) leads a coal train through Keenesburg at sunrise.

A bright orange sunrise glints off the stainless steel of the California Zephyr as it runs through Keenesburg, Colorado.

BNSF 2749 (GP39E) runs through the trees at Lyons, Colorado.