The majority of power in the Denver North Yard on this day is light units, including UP 1507 (GP40M).

UP 1507 (GP40M-2) sits with other light motors in the Union Pacific's North Yard for their turn to shuffle cars.

UP 1507 has had an interesting career, starting life for the Baltimore and Ohio in 1969 as a GP40, then moving to the Southern Pacific after being rebuilt as a GP40M-2. You can now find it workin... (more)

UP 1507 (GP40M-2) takes care of business in the Union Pacific's North Yard.

UP 1507 started life as a GP40 in 1969 for the Baltimore and Ohio Railroad before being rebuilt at a GP40M-2. You can now find it working the local runs out of the Denver, Yard.

Light power works the UP North Yard in Denver, Colorado. UP 1507 started life as a GP40 in 1969 for the Baltimore and Ohio Railroad, then was rebuilt as a GP40M-2 and worked for the Southern Paci... (more)

UP 1507 (GP40M-2) and other light power work the UP's North Yard in Denver, Colorado.

A heavy March snow storm requires that the crew of UP 1507 (GP40M-2) be extra attentive to the switches in the North Yard in Denver, Colorado.

UP 1507 leads a short freight over the South Platte River in lower downtown Denver, Colorado. She started life in 1969 as a GP40 for the Baltimore and Ohio Railroad wearing the Chessie System col... (more)

UP 1507 (GP40M-2) is an ex Baltimore and Ohio engine which was built in 1969. Here it leads the local over the South Platte River in downtown Denver, Colorado.

A sunburnt UP 1507 (GP40-2) gets ready to lead a freight out of the UP's North Yard.

UP 1507 (GP40M-2) climbs the grade past a farmhouse as it heads to Tunnel #1 on the Moffat Line.

Looking more like a model train on a layout, UP 1507 (GP40M-2) leads two other units in pulling a pair of hoppers up to Tunnel #1 on the Moffat Line.

Here's something you don't see every day. UP 1507 (GP40M-2) uses the Rocky Siding to pull two hoppers across Highway 93 in Arvada, Colorado. The trio of engines will pass through Big 10 Curve and... (more)

An extra Potash local makes an unusual late afternoon appearance as it exits Bootlegger Canyon heading to the Potash Mine which is located at the end of the Cane Creek Branch. Corona Arch is seen ... (more)