BNSF 729 (Dash9) waits in the BNSF engine servicing facility for orders to head to the Denver Yard and pick up a train.

Rocky Mountaineer's two GP40-3's wait in the UP's North Yard for servicing.

UP 6372 (AC4400CW) leads an oil can train towards Arvada, Colorado on the Moffat Tunnel Sub.

Union Pacific's magnificent Big Boy #4014 rounds the corner at Speer, Wyoming as it begins the trip to Denver, Colorado.

Rio Grande Southern #20 (4-6-0) runs past the vintage rolling stock at the Colorado Railroad Museum in Golden, Colorado.

BNSF 5029 (Dash9) is bringing a freight into Denver as an outbound ACe-led freight meets alongside the intermodal facility on the north side of the City.

BNSF Warbonnet 4718 (Dash9) along with paired Canadian Pacific motor ads a splash of color to the orange at the BNSF engine servicing facility in Denver, Colorado.

A recently refurbished BNSF MAC 9738 (designated SD70MACe) waits in the Denver engine yard for a train assignment.

BNSF 1732 (SD40-2) gets ready to move a cut of container cars out of the intermodal facility in Denver, Colorado.

RTD commuter rail train 4033 (Hyundai Eagle) runs on the elevated track over the BNSF engine facility and heads towards Thornton, Colorado.

RTD commuter rail train 4030 (Hyndai Eagle P3) heads out of Union Station as the passenger cars on the UP Big Boy special back into downtown.

The California Zephyr has just come down the hill past the Rocky Siding and is now running through Little Ten Curve as it begins the climb through the Colorado Rocky Mountains.

BNSF 6162 (ES44AC) sits all alone as the helper engine based at Spruce, Colorado. It will be called upon to help the heavy coal trains get over Palmer Divide.

The sunrise is just minutes old as BNSF 8585 (SD70ACe) ran west on the Brush Sub through West Tonville.

BNSF ACe 9078 muscles a coal train through Monument, Colorado under a double rainbow.