UP 1507 (GP40M) sits waiting in the Union Pacific's North Yard for its turn to sort cars.

Snow and subfreezing temperatures blanket the Union Pacific's North Yard in Denver, Colorado.

UP 1507 (ex Southern Pacific GP40M built in 1969) joins other light power in the Union Pacific's North Yard in Denver, Colorado.

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.