UPY 546 (ex CNW GP15-1) works the UP's North Yard in Denver. Ex Chicago & North Western units are easy to spot with the plethora of engine grilles after the cab.

Duo of EMD GP15-1, UPY's 546 and 681, leading a local train of Union Pacific by UP Limon Sub in Aurora, Colorado.

UPY 546 works the North Yard in a blizzard.

UPY 546 (GP15-1) shoves another cut of cars back into the ladder at the UP's North Yard.

UPY 546 (GP15-1) muscles a cut of freight cars for sorting in the UP's North Yard in Denver.

A blue GATX smurf is hiding in a school of armour yellow UP engines in the service area at the North Yard.

UPY 546 (ex Chicago & Northwestern GP15-1) gets repositioned in the North Yard after servicing.

The Rocky Mountains provide the backdrop to the view of the 36th Street Yard.

It wont be long before the snow flies in the North Yard and a white blanket transforms an otherwise hot and grimy yard into a winter playground for big toys.

A spring blizzard pounded the Denver area, with whiteout conditions from high winds and nearly 2 feet of snow in some places.

With temperatures well below freezing the UP North Yard remains active, with UPY 546 (GP15-1) shuffling cars and UP 695 and 688 waiting their turn.

UPY 546 pulls freight like a Baldwin in the 36th Street Yard

Here we see a unique pair of engines working the North Yard. UPY 546 (GP15-1) and UPY 1326 (MP15DC) were both originally built one year apart for the Chicago & Northwestern. 1326 was built in 19... (more)

A new engine for the data base is UPY 546 (GP15-1), seen here sorting a string of grain cars in the North Yard.