BNSF 3003 (GP40M) leads an oil can train west on the Brush Sub, leaving Hudson, Colorado behind as it heads to Denver.

BNSF 3003 (GP40M) leads a string of oil cans west on the Brush Sub towards Tonville, Colorado.

BNSF 3003 (GP40M) moves a cut of cars out of the terminal in Hudson, Colorado.

BNSF 3003 (GP40M) runs past the silo at Hudson, Colorado as it heads west towards Denver on the Brush Sub.

BNSF 3003 (GP40M) leads an oil can train west on the Brush Sub towards Denver, Colorado.

UP 1507 (GP40M) passes the Union Pacific's operations building at the North Yard in Denver, Colorado.

UP 1507 (GP40M) heads to the BNSF yard in Denver, Colorado with a cut of freight cards from the Union Pacific's North Yard.

UP 1507 (GP40M) brings a freight into the BNSF yard in downtown Denver, Colorado.

UP 1502 (GP40M) works the North Yard in Denver Colorado.

UP 1507 (GP40M) leads a freight towards the BNSF yard in Denver, Colorado.

UP 1507 (GP40M) is entering the BNSF's Denver Yard with a cut of freight cars and will head back to the UP North Yard after dropping off the cars.

UP 1507 (GP40M) moves a cut of cars early in the morning in the Union Pacific's North Yard in Denver, Colorado.

A wide-angle view of the Union Pacific's North Yard in Denver, Colorado shows the fuel and sand service islands on the left, the ready tracks in the middle (with a former Southern Pacific GP40M - ... (more)

UP 1507 (GP40M) sorts cars in the North Yard in Denver, Colorado.

UP 1507 (GP40M) sits waiting in the Union Pacific's North Yard for its turn to sort cars.