The blue hour begins to give way to the pink color of sunrise as BNSF 2712 (GP39-3) works a cut of cars in the yard in a snowy downtown Denver, Colorado.

A gaggle of light power (Geeps and SD40-2s) wait for orders after being serviced at the engine facility in Denver, Colorado.

BNSF light and heavy power are mixed at the engine servicing facility in Denver, Colorado. Some are waiting for servicing, and some are waiting for orders to head to the Denver Yard.

BNSF 2712 GP39-2 joins a mix of light and heavy power waiting for servicing or assignments at the engine facility in Denver, Colorado.

Here is a wide-angle view of the BNSF engine servicing facility in Denver, Colorado.

An Executive Grinstein SD70MAC waits for service at the BNSF engine serving facility in Denver, Colorado.

BNSF 2712 (GP39-2) climbs out of the bowl at the Denver Yard with a cut of cars.

BNSF 2712 (GP39-2) waits for servicing at the Denver engine facility.

BNSF 2712 (GP39-2) sits glowing in the engine servicing yard in Denver at sunrise.

After succesfully navigating the Wind River Canyon, BNSF 2712 leads the charge along the banks of the beautiful Boysen Reserve.

The East local has nearly finished it's journey through the canyon as it crosses the Wind River. Just to the North is the Boysen Dam. Near the dam, the train will tunnel through the terrain and un... (more)

The East Local is dwarfed by the mighty walls of the Wind River Canyon. Here, the train is seen emerging from one of the three tunnels in the canyon itself.

The East Local slowly makes it's way through the Wind River Canyon.

BNSF 2712 leads the East Local into the Wind River Canyon.

BNSF 2712 leads a short train along the Bighorn River, just North of Thermopolis.