A power heavy consist with 8 motors moves to the head end of a train after swapping out a defective DPU.

The fall colors are in full swing for the passengers and crew of the California Zephyr as it runs through Tolland, Colorado on the Moffat Tunnel Sub.

Amtrak engine #136 (P42DC) leads the California Zephyr through the Denver Yard as it heads to Union Station.

Rio Grande Southern engine #74 (2-8-0) was built in 1898 by the Brooks Loco Works in Dunkirk, NY. It is on display at the Colorado Railroad Museum located in Golden, Colorado.

UP 688 (GP38-2) repositions in the North Yard to assemble a train.

UP 1507 (GP40M-2) works the North Yard sorting freight cars into the various ladders.

BNSF 5640 (AC4400CW) runs under Wadsworth Boulevard as it heads to Denver on the Front Range Sub.

BNSF 5640 (AC4400CW) leads a stack train past the Union Pacific's North Yard in Denver, Colorado.

The California Zephyr runs past the silo at Roggen, Colorado as sunrise tries to break through the clouds on the horizon.

UPY 618 (GP15N) sorts a string of freight into the North Yard ladders in Denver, Colorado.

BNSF 1984 (SD40-2) moves into the intermodal facility to pull a cut of container cars out of the yard.

BNSF 6294 (ES44AC) waits for orders to head to the Denver Yard and a waiting train.

BNSF 2857 (GP39-2) muscles a freight towards the Broomfield Siding on the Front Range Sub.

BNSF 6723 rolls through Westminster on the Front Range Sub as it leads a grain train towards Denver.

The BNSF has rotated light power at the Longmont Depot. BNSF 2604 (GP39-3) holds station until orders arrive to take a freight to Lafeyette on the Front Rangs Sub.