UP 695 (GP38N) joins other light power to work the Union Pacific's North Yard in Denver, Colorado.

A sight not often seen is the Union Pacific sending two motors from the BNSF yard in Denver, Colorado, passing over the South Platte River as they head to the Union Pacific's North Yard.

Amtrak engine #15 (P42DC) leads the California Zephyr through Keenesburg, Colorado as a pastel sunrise greets the crew and passengers.

BNSF 5172 (Dash9) leads a long train past the Union Pacific's North Yard in Denver, Colorado.

BNSF 9007 (SD70ACe) shoves an empty coal train into the yard in Denver, Colorado.

RTD commuter train #4033 (Hyundai Eagle P3) runs the high line past the BNSF engine service facility in Denver, Colorado.

RTD commuter train #4019 (Hyundai Eagle) takes the high track past a variety of motors in the Denver BNSF yard.

BNSF 6194 (ES44AC) is part of a 5-motor lash-up that will soon head to the Denver Yard to a waiting train.

BNSF 2371 (GP38-2) works sorting a cut of cars in the massive yard in Denver, Colorado.

An H-1 painted BNSF 2371 (GP38-2) works the Denver Yard sorting cars.

The California Zephyr runs through Keenesburg as the sunrise casts an orange glow on the stainless-steel cars and silver engines.

Colorado Pacific Rio Grande Railroad's #209 (SD70MAC) waits in Alamosa, Colorado for the next run to Walsenburg.

Sunrise casts its early glow onto the engine servicing facility in Denver, Colorado.

BNSF 2857 (GP39-2) runs through past apartments in Broomfield, Colorado.

BNSF 2857 (GP39-2) runs through Boulder, Colorado on the way to Louisville.