The Union Pacific North Yard in Denver offers a mix of power. Light power pair up to sort cars and heavies get service so that they can take trains out of the yard once assembled.

UP 1479 (GP40M-2) waits in the Union Pacific's North Yard in Denver, Colorado.

UP 1479 leads three other UP engines and a mixed freight out of the BNSF's Denver Yard.

UP 1479 leads a mixed freight out of the Denver Yard and over the South Platte River.

After spotting empty hoppers and loaded tank cars, the Cañon City local departs Portland under a fantastic mix of threatening skies and a setting sun.