A large and colorful rainbow provides the backdrop as BNSF 1746 (SD40-2) runs west on the Brush Sub between Hudson, Colorado and Denver.

BNSF 1746 (SD40-2) heads towards Denver on the Brush Sub at Hudson, Colorado.

BNSF 1746 (SD40-2) leads the local from Hudson to Denver, Colorado on the Brush Sub.

BNSF 1746 (SD40-2) runs through Hudson, Colorado, and leaves behind a rainbow that has developed from a massive thunderstorm that has just passed over the area.

BNSF 1746 (SD40-2) leads the Hudson Local oil can train west on the Brush Sub towards Denver, Colorado.

BNSF 1746 (SD40-2) leads the Hudson Local west on the Brush Sub through the signal at Tonville, Colorado.

BNSF 1746 (SD40-2) heads into the BNSF yard in Denver, Colorado to shuffle cars.

BNSF 1746 (SD40-2) works sorting a cut of cars in the Denver Yard.

BNSF 1746 (SD40-2) sort a string of cars in the yard in downtown Denver, Colorado.

BNSF 1746 (SD40-2) runs over the South Platte River in downtown Denver as it leaves the Denver Yard with a cut of cars.

BNSF 1746 (SD40-2) works a cut of oil cans in the Denver Yard.

A pair of SD40-2's in fresh Heritage III paint work in the Denver yard sorting cars.

BNSF 1746 (SD40-2) heads to the Denver Yard under the RTD Light Rail Train tracks to begin shuffling freight cars.

BNSF 1746 (SD40-2) crosses the South Platte River with a Bluebonnet and a cut of freight cars that will then be sorted back in the yard.

BNSF 1746 (SD40-2) takes a cut of cars out of the Denver Yard for sorting.