The California Zephyr runs through the North Yard in Denver, Colorado.

UP 1502 (GP40M-2) is a 52 year old former Baltimore & Ohio, CSX, and Southern Pacific motor which was built in 1971.

UPY 691 (GP15-1) works the North Yard in Denver, Colorado.

An inbound UP freight led by UP 8013 (AC45CCTE) passes under the signal bridge before entering the North Yard in Denver, Colorado.

The California Zephyr runs with a single engine towards Denver, Colorado on the Brush Sub.

A fresh layer of snow overnight greets BNSF 2585 (GP39-3) as it gets ready to leave the yard in Golden, Colorado.

Light snow is falling as Amtrak engine 007 joins a 50th anniversary P42 as they lead the California Zephyr through Coal Creek Canyon and over Highway 72.

An orange Colorado sunrise greets the crew and passengers of the Amtrak Winter Park Express as it makes the run between Denver and the ski resort just on the west side of the Continental Divide. ... (more)

The BNSF orange pops against the snow as light and heavy power wait for servicing or train assignments.

The California Zephyr splits the signals at sunrise as it runs towards Wiggins, Colorado on the Brush Sub.

BNSF 3275 (ES44C4) leads a westbound freight down the grade at Rocky, Colorado, passing another BNSF Freight that is waiting on the siding.

BNSF Ace 9023 leads a loaded coal train through the snow at Castle Rock, Colorado.

BNSF 5419 (Dash9) leads a freight east of Wiggins, Colorado on the Brush Sub.

BNSF Bluebonnet 2854 (GP39-2) waits at the Longmont Depot for the call to duty.

BNSF 9023 (SD70ACe) runs towards Larkspur Colorado as a late spring storm has flocked the trees with snow.