BNSF 9709 (SD70MAC) drops off a cut of cars in the yard in Fort Collins, Colorado and will head back to Longmont, Colorado.

BNSF 267 (SD75M) heads to a string of cars in the yard in Fort Collins, Colorado.

Hudson Terminal Railroad's veteran #646 (Alco S1) heads into the yard to pull out a string of oil cans.

Hudson Terminal Railroad's #4027 (RS4TC) moves a cut of oil cans in the yard in Hudson, Colorado.

BNSF 2745 (GP39E) meets a heavy moving in the opposite direction in the Denver Yard.

BNSF 2708 (GP39-2) gets ready to leave the yard in Golden, Colorado and head to Denver.

BNSF 1600 (SD40-2) passes a pair of heavies as they sort a cut of cars in the Denver Yard.

Hudson Terminal Railroad's SD40-2 motors build a stack train in the terminal at Hudson, Colorado.

BNSF 8998 (SD70ACe) leads the Coors Beer Train out of the North Yard and heads for Golden, Colorado, home of the Coors Brewery.

BNSF 8998 (SD70ACe) leads the return Beer Train out of the Denver Yard and heads for Golden, Colorado.

UP 1507 (GP40M-2) works the North Yard in Denver, Colorado.

UP 1957 (SD40N) works the North Yard in Denver, Colorado, sorting a line of freight cars.

It is a light day in terms of Union Pacific motors at the North Yard in Denver, Colorado.

BNSF 8753 (SD70ACe) runs towards the yard in downtown Denver, Colorado as other motors jockey for position.

BNSF 5908 (ES44AC) runs through Big Ten Curve on the Moffat Tunnel Sub.