An early UP passenger train leaves Denver, probably for Omaha.

UPY 625 (GP15-1) crosses the South Platte River in downtown Denver, Colorado after having made a transfer of cars to the BNSF yard.

UP 7603 (ES44AC) waits for service in the North Yard in Denver, Colorado. Sharp eyed viewers will notice a patched Soutern Pacific and a BNSF motor also in the yard.

UP 8106 (ES44AC) pulls up to the servicing island in the Union Pacific's North Yard in Denver, Colorado.

BNSF 7911 (ES44DC) leads a stack train out of the yard in Denver, Colorado.

UP 5527 (ES44AC) joins a string of heavies as they wait for service in the North Yard in Denver, Colorado.

A golden Colorado sunrise catches the Winter Park Express Ski Train passing by the Union Pacific's North Yard in Denver, Colorado.

BNSF 3014 (SD40-2) heads into the yard in downtown Denver, Colorado as it looks for a string of cars to start sorting.

BNSF 1736 (SD40-2) heads to the servicing rack at the engine facility in Denver, Colorado.

The California Zephyr leaves Denver, Colorado while running underneath the Park Avenue Viaduct and passing BNSF 6286 (ES44AC), which sits at the BNSF engine servicing facility.

An RTD commuter train runs past the BNSF engine servicing facility in Denver, Colorado.

RTD 4069 (Hyundai Eagle P3) passes the North Yard in Denver, Colorado as it heads to Denver Union Station.

UP 5285 (ES44AC) sits in the North Yard in Denver, Colorado as it waits orders to head to a train.

UP 7739 (ES44AC) heads west from Denver on the Moffat Tunnel Sub with an oil can train.

UP 8106 (ES44AC) waits for service at the fueling rack in the North Yard in Denver, Colorado.