UPY 691 (GP15-1) works the Union Pacific's North Yard in Denver, Colorado.

One of the coolest engines you will see working the UP North Yard in Denver is UPY 691, a well worn GP15-1.

A veteran UPY 691 (GP15-1) waits for a mate to pair up and then will sort cars in the Union Pacific's North Yard in Denver, Colorado.

UPY 691 (GP15-1) gets busy moving cars in the UP's North Yard in Denver, Colorado.

A bay window caboose is tucked in behind the light power sitting in the Union Pacific's North Yard in Denver, Colorado.

UPY 691 (GP15-1) makes smoke as it moves a cut of cars in the Union Pacific's North Yard.

UPY 691 (GP15-1) works the UP North Yard in Denver along side some fresher looking power.

Its a wonder how UPY 691 (GP15-1) has so far alluded the rebuild or paint shop. She was built in 1982 for the Missouri Pacific and if you look closely you can see the MP blue paint wearing throug... (more)

"UP Local at Univar Solutions Denver" A Union Pacific remote control local prepares to pull empties from Univar Solutions located on one of many industrial spurs off of the Limon... (more)

Light power helps sort cars in the Union Pacific's North Yard.

UPY 691 (GP15-1) works a cut of cars in the UP's North Yard while a bunch of heavies are lined up for a power move.

UPY 691 (GP15-1) has still managed to escape the paint shop, which is OK with me.

A Denver Yard crew has just dropped a set of road locomotives off in the yard for their next assignment and is now pulling away to continue switching work in the yard.

Locomotives:
UPY ... (more)

UPY 691 (GP15-1) has finished sorting a string of freight in the North Yard and will soon tackle the new cars just brought into the yard by UP 5561.

The North Yard remote control crew brings forward UP 1823 (GP38-2) while UPY 691 (GP15-1) handles a string of hoppers.