UPY 625 (GP15-1) sports a shark mouth on the pilot as it works sorting cars in the North Yard in Denver, Colorado.

UP Y625 (GP15-1) sports a unique shark-mouth pilot blade as it sits in the Union Pacific's North Yard in Denver, Colorado.

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

UPY 625 (GP15-1) sits in the North Yard with a visiting Simplot Fertilizer switcher in an eye-catching lime green paint job.

UPY 625 (GP15-1) joins other light power in the North Yard in Denver, Colorado.

UPY 625 (GP15-1) gathers a cut of freight cars in the UP's North Yard in Denver, Colorado.

A remote-control engineer catches a ride back to the head end of the Union Pacific's North Yard in Denver, Colorado.

UPY 625 (GP15-1) works the Union Pacific's North Yard in Denver, Colorado.

UPY 625 is one of many ex-Missouri Pacific GP15-1's that can be found working the North Yard in Denver, Colorado.

UPY 625 (ex-Missouri Pacific GP15-1) works the Union Pacific's North Yard in Dever, shuffling sand cars.

UPY 625 (GP15-1) has just dropped off a string of container cars which will later be taken out of the yard by a pair of heavy movers.

The sun is up and the Geeps are working the North Yard.

UPY 625 (GP15-1) and UPY 1484 (MP15AC) sort freight cars in the UP's North Yard in Denver.

UPY 625 (GP15-1) gets ready to sort a string of freight in the 36th Street Yard

UPY 625 (GP15-1) works hard to pull a string of freight out of the 36th Street Yard for sorting.