RTD commuter train #4128 (Hyundai Eagle P3) takes the elevated track over the California Zephyr, which is arriving at the Denver Yard prior to backing into Denver Union Station.

BNSF 3014 (GP40-2) sits in the engine serving yard along with a GP39 and the red caboose and white cars of the BNSF fire train.

UP 1957 (SD40N) works the North Yard in Denver, Colorado.

Here is a good look at DODX 39497, the Department of Defense's nuke cask heavyweight flatcar designed to carry spent nuclear fuel rods. It stopped by the yard in Denver for a few days.

Amtrak engine #71 (P42DC) leads the California Zephyr into downtown Denver, Colorado.

UP 737 (GP38-2) heads into the North Yard, passing a bay window caboose which is on the active roster and used as a shoving platform on trips to nearby businesses.

UP 1837 (SD40N) shows signs that it might have spent some time in California before arriving in Denver.

Amtrak engine #174 (P42DC in Phase VII Paint) leads the California Zephyr through downtown Denver and will soon back into Union Station.

BNSF Geeps are at the ready as the California Zephyr passes through the yard in Denver, Colorado.

A coal train waits for its power as UP 6421 (ES44AC) waits for a green signal to head west on the Moffat Tunnel Sub.

UP 6179 (ex-Southern Pacific AC4400CW) leads a power-heavy lash up as it waits for a green signal to head into the Colorado Rocky Mountains on the Moffat Tunnel Sub.

Amtrak's Phase VII heritage #174 (P42DC) backs the California Zephyr 6 train into Denver's Union Station.

There is a lot to see in this picture of the yard at the BNSF Denver engine servicing facility, including an ACe BNSF 8579, two armored cabooses of the Department of Energy, a special container ve... (more)

D&RGW 5201 is leaving Denver Colorado with a westbound freight in 1957. Otto Perry photo, from my collection.

UP 1507 (GP40M-2) sits with other light power in the North Yard in Denver, Colorado.