RTD commuter train 4055 (Hyundai Eagle P3) runs past the BNSF engine servicing facility in Denver, Colorado.

BNSF 6402 (ES44AC) leads a freight through Hudson, Colorado just as the sun rises above the tracks.

UP 7511 (ES44AC) crosses the historic Santa Fe Bridge which spans Spruce Mountain Road in Larkspur, Colorado.

Union Pacific 7511 (ES44AC) gets ready to lead a loaded coal train through Larkspur, Colorado.

BNSF 7006 (ES44C4) leads a windmill blade train through Spruce, Colorado and will shortly be running through Palmer Lake.

With just minutes of sunlight left in the golden hour, BNSF 5798 (ES44AC) leads an empty coal northbound on the Joint Line towards Denver, Colorado.

A bluebonnet waits for service among the other Heritage III painted BNSF motors at the BNSF engine facility in Denver, Colorado.

BNSF 5612 (AC4400CW) is about the cross the Santa Fe Bridge in Larkspur in the early morning blue hour.

BNSF 5880 (ES44AC) shoves an empty coal train through the girder bridge at Nixon, Colorado.

If you like signals then Greeley, Colorado is the place to visit. Here we see UP 8499 (SD70ACe) running through the City in a section that has a myriad of signals for the main track, an industria... (more)

The California Zephyr with 193 (P42DC) on leads rounds the corner in Coal Creek Canyon and begins the climb up Tunnel #1.

BNSF 5880 (ES44AC) clears the bridge in Nixon, Colorado and will shove the empty coal all the way to Denver.

UP 7511 (ES44AC) pulls a loaded coal train past a BNSF helper unit stationed on the siding at Spruce, Colorado.

The wide open space at Spruce, Colorado enables the entire BNSF windmill blade train to be seen, from the single engine BNSF 7006 (ES44C4) at the head end to the single DPU at the rear.

BNSF 7006 (ES44C4) leads a windmill blade train through Castle Rock, Colorado on the Joint Line.