Sunrise in the UP North Yard catches a variety of light power waiting for the day's assignments.

UPY 577 pulls a string of freight out of the North Yard for sorting while another string of cars are brought into the yard and a BNSF pair pushes yet another freight north towards the Moffat Line.

The 36th Street Yard in Denver is a good place to watch trains. You can usually find a nice variety of Geeps working to assemble trains and a variety of heavies ready to take the cars to parts un... (more)

A former Southern Pacific engine stopped by the North Yard for servicing. Seeing a SP unit in the Denver area is becoming increasingly uncommon.

Amid heavy snowfall the sorting of freight cars continues in the North Yard.

UPY 577 (GP15-1) muscles a freight back into the North Yard while UP 8707 (SD70ACe) waits for the go signal to move a loaded coal train south towards the Joint Line.

UPY 577 GP15-1) and UP 1672 (SD40N) muscle a long, colorful freight which will then get broken apart and sorted into the North Yard.

The Geeps are working the 36th Street yard in near whiteout conditions thanks to a February blizzard that included 30 mph winds.

UPY 577 (GP15-1) works a cut of freight cars in the North Yard while UPY 629 is stuck in the middle of two strings

UP power from a selection of decades awaits its next assignment at the old Rio Grande North Yard near downtown Denver.

With the emergence of remote control engineers, there appears to be no need to man the control tower overlooking the Union Pacific's North Yard - at least I have yet to see anyone up there. I bet... (more)

An ex-MoPac GP15-1 built in December of 1976 shares yard duty with a former Rio Grande motor as they both take a break today at the UP’s 36th street yard.

UPY 577 (GP15-1) pulls a string of freight cars out of the 36th Street Yard, ready to begin humping them back into their assigned tracks.

Baby tunnel motor UPY 577 (GP15-1) takes a freight into the south entrance of the 36th Street Yard

The UP power that is often assigned to the 36th Street Yard tends to be reliable but older units like UPY 577 (GP15-1 built in 1976) and UP 1343 (GP40-2 built in 1974).