BNSF 1746 (SD40-2) heads to the Denver Yard under the RTD Light Rail Train tracks to begin shuffling freight cars.

BNSF 4465 (Dash) repositions in the BNSF engine servicing yard just at the California Zephyr backs into Denver's Union Station.

The UP 4014 backs into Denver Union Station. Steve Lundt photo

A good-looking BNSF Warbonnet 729 (Dash9) waits for a train at the engine servicing facility in Denver, Colorado.

Masters of their craft. The California Zephyr made a stop in Denver, Colorado right after the Union Pacific's Big Boy locomotive backed into Union Station. Gary Meyer on left is the engineer of ... (more)

There was a rare sight in downtown Denver this weekend as Union Pacific Big Boy 4014 (4-8-8-4) backed a special passenger train into Union Station in downtown Denver, Colorado

Back in 1994 Denver Union station was a bit of a building site! AMTK 839 and partner wait to depart with the California Zephyr.

Denver Rock Island Railroad 1083 moves to a client and crosses Packing House Road.

Union Pacific's Big Boy has just spun around on the wye and is headed towards the Moffatt Subdivision to spend the night with Denver's skyline standing tall behind them.

The California Zephyr arrives in Denver, Colorado and runs through the BNSF's Denver Yard before backing into Union Station.

The California Zephyr is pulled by Amtrak engine 202 as it passes the elevated track of the Denver RTD commuter train that runs to Denver International Airport.

The Union Pacific utilizes a number of rebuilt SD40-2 units (designated SD40N) in the North Yard in Denver, Colorado.

UP 7696 (AC45CCTE) holds for a green signal to proceed across the Belt Line in Denver to the Greeley Sub.

The BNSF pumpkin patch in Denver, Colorado includes 6359 (ES44AC) waiting for an assigned train.

The Denver Rock Island Railroad's SW1500 moves a cut of cars across Packinghouse Road in Denver, Colorado.