BNSF 1958 (SD40-2), still sporting its original Cascade Green paint from the Burlington Northern days, crosses a bridge over the South Platte River in Denver, Colorado.

BNSF 1680 (former Burlington Northern SD40-2) waits for an assignment at the BNSF engine servicing facility in Denver, Colorado.

BNSF 6149 (ES44AC) leads a freight eastbound on the Moffat Tunnel Sub through Pinecliffe, Colorado.

BNSF 6616 (ES44C4) is bathed in an orange glow from a spectacular Colorado sunrise on the Brush Sub.

BNSF 6087 (ES44AC) leads a power heavy train through Rollinsville, Colorado as it heads to the Moffat Tunnel.

BNSF 6037 (ES44AC) leads a freight into the BNSF yard in Golden, Colorado.

BNSF 3965 (ET44C4) leads a freight train out of the big yard in Denver, Colorado.

BNSF 2604 (GP39-3) heads to the yard in Longmont, Colorado to pick up the local train for Lafeyette, Colorado.

BNSF 2698 (GP39-3) pulls next to the Longmont Depot to pick up orders before heading to the yard.

BNSF 2371 (GP38-2) in Heritage I paint heads into the Denver Yard to sort cars.

BNSF 2745 (GP39E) in Cascade Green BN paint works the Denver Yard sorting cars.

UP 7788 (C45ACCTE) leads the GJ train through Leyden, Colorado on the Moffat Tunnel Sub.

UP 7634 (ES44AC) rounds the corner at Rocky, Colorado as it heads west into a bright sunset on the Moffat Tunnel Sub.

Union Pacific's Western Pacific heritage engine #1983 waits for orders after being serviced at the North Yard in Denver, Colorado.

The snow clouds are breaking up as Union Pacific 6891 (AC4400CW) muscles a freight towards Arvada, Colorado.