Denver Rock Island Railroad's GP9 sits with other motors in the yard in Denver, Colorado.

A Kansas City Southern Belle ES44AC leads a grain train south on the Joint Line between Greenland and Palmer Lake, Colorado.

BNSF 9017 (SD70ACe) leads a coal train through the S curve at Spruce, Colorado as it heads south on the Joint Line.

BNSF ACe 9017 runs over the Santa Fe Bridge in Larkspur, Colorado.

BNSF 9082 (SD70ACe) muscles a coal train through Keenesburg, Colorado on the Brush Sub.

BNSF 6751 (ES44C4) joins other heavies in the yard of the engine servicing facility in Denver, Colorado as a RTD commuter train drops down from the elevated track.

Amtrak's Winter Park Express is about to enter Tunnel 29 at Pinecliffe, Colorado as heavy snow falls in the Colorado Rocky Mountains.

The pilot of UP 8051 (ES44AC) pushes the heavy snow off the rails as it leads an oil can train through Tolland, Colorado.

Heavy snow is falling at the east portal of the Moffat Tunnel as UP 8051 (ES44AC) splits the signals while running east on the Moffat Tunnel Sub towards Tolland, Colorado.

With the back of the oil can train still coming through Tunnel #1 in the background, UP 8995 (SD70AH) heads towards Blue Mountain Road in Coal Creek Canyon.

A frosty-chinned BNSF 5700 (ES44AC) leads a freight through Arvada, Colorado on the Moffat Tunnel Sub.

BNSF 2828 (GP39-2M) leads a load of lumber off the Broomfield Siding towards Lafeyette, Colorado.

BNSF 2530 (GP39-3) crosses the highway with a load of lumber for a customer in Lafeyette, Colorado.

A crewmember of BNSF 2530 (GP39-3) is walking back after throwing a switch allowing the Buck Local to get on the siding in Broomfield, Colorado.

Darkness falls at Pinecliffe, Colorado as Amtrak's Winter Park Express Ski Train runs through Tunnel #29 on its way back to Denver Union Station.