A cut of heavy motors makes their way to the fuel island while UP 1980 (GP38-2) holds for an assignment to sort cars in the North Yard in Denver, Colorado.

The first light of the morning finds UP 1957 (SD40N) positioning to shuffle cars at the North Yard in Denver, Colorado.

UP 1995 (SD70ACe) in the Chicago Northwestern heritage scheme gets ready to take an empty coal train west on the Moffat Tunnel Sub.

A set of BNSF locomotives have come over from the railroad’s 23rd Street locomotive facility to tie on to a freight train on the 20th Street Siding on Colorado’s Joint Line at Denver, Colorado... (more)

BNSF 9201 (SD70ACe) joins a Warbonnet as they wait for service at the BNSF engine facility in Denver, Colorado.

BNSF 7728 (ES44DC) leads a stack train under the Park Avenue Viaduct as it gets ready to leave Denver on the Brush Sub.

It is great to see a SW8 working the industrial areas in Denver served by the Denver Rock Island Railroad.

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

UP 5518 (C45ACCTE) brings the California Zephyr #6 into Denver, Colorado as it runs under the Park Avenue Viaduct. Once in the yard it will then back into Denver's Union Station.

UP 1957 (SD40N) runs with open doors in the Union Pacific's North Yard in Denver, Colorado.

BNSF 1579 (SD40-2) sits on the time out track at the BNSF engine servicing facility in Denver, Colorado.

Sunrise at the BNSF engine servicing facility in Denver, Colorado finds a Maintenance of Way team getting ready to head out on the Joint Line for track improvements.

UP 1381 (Ex Southern Pacific GP40-2) holds station in the North Yard in Denver, Colorado.

This is the headquarters of the Denver Rock Island Railroad located in north Denver, Colorado.

A peek into the Diesel House reveals Southern Pacific GE AC4400CW No. 309 on Track 3, along with several other Union Pacific locomotives on adjoining tracks, at UP’s former Rio Grande Burnham Sh... (more)