The Union Pacific still operates a number of former Missouri Pacific GP15-1's in the North Yard in Denver.

A trio of SD40's are at the ready in the Union Pacific's North Yard in Denver, Colorado.

A crewman from the Denver Rock Island's GP38-2 gets ready to swing on as the train moves a cut of oil cans.

UP 6454 (AC4400CW) holds in the Union Pacific's North Yard before leading an officer's special up the Moffat Tunnel Sub.

Denver Rock Island Railroad's DRIR 02 sorts cars in a yard in Central Denver, Colorado.

Denver Rock Island Railroad's GP38-2 moves a cut of oil cans to a yard in Denver.

UPY 625 (a former Missouri Pacific GP15-1) waits for the OK to move into the yard to sort freight cars.

UP 6454 (AC4400CW) sits in the North Yard in Denver until the green is given to journey up the Moffat Tunnel Sub and over to Grand Junction in the west side of Colorado.

UP 6454 (AC4400CW) waits in the North Yard in Denver, Colorado before taking an officers special up the Moffat Tunnel Sub.

BNSF ACe 9007 runs past a meadow of wild sunflowers as it heads west on the Brush Sub at Keenesburg, Colorado.

BNSF 7205 (ES44DC) passes a silo as it heads into the sunrise at Roggen, Colorado.

BNSF 1798 (SD40-2) moves a cut of cars out of the Denver Yard.

Denver Rock Island Railroad's GP38-2 (A former Mount Hood Railroad motor) moves a load of oil cans to a yard in Central Denver, Colorado.

Denver Rock Island Railroad's GP38-2 (A former Mount Hood Railroad motor) drops off a couple of oil cans in the yard in Central Denver, Colorado.

BNSF 1798 (SD40-2) crosses the South Platte River as it pulls a cut of cars out of the Denver Yard.