BNSF 8403 (SD70ACe) runs south on the Joint Line track between Spruce and Palmer Lake, Colorado.

BNSF 8403 (SD70ACe) pulls a loaded coal train through Spruce, Colorado.

BNSF 7529 (ES44DC) leads an officer's special train over the iconic Santa Fe Bridge in Larkspur, Colorado.

BNSF 7529 (ES44DC) leads an officer's special train with an interesting variety of passenger cars.

BNSF ran a special train on the Joint Line from Denver to Pueblo. The consist was led by 7529 (ES44DC) and included a variety of passenger cars.

With a massive thunderstorm cell looming in the background, RTD 4030 (Hyundai Eagle) runs on the commuter rail line linking Denver International Airport with downtown Denver.

Amtrak engine #160 (P42DC) in the 'Pepsi Can' 50th anniversary paint scheme made its debut in Colorado leading the California Zephyr through Keenesburg.

Amtrak 'Bumblebee 203' carries the Operation Lifesaver 50th Anniversary markings and was spotted this week in Denver, Colorado attending a convention on railroad safety.

Amtrak engine 134 (P42DC) leads the California Zephyr #6 train east through Roggen, Colorado.

BNSF 2698 (GP39-3) works the grain elevator at Roggen, Colorado.

Shades of the past. If you look closely, you will spot a few 'Old School' engines in the BNSF engine servicing facility, including a Warbonnet, two Cascade Green Burlington Northern units as an E... (more)

The California Zephyr 5 train typically leaves Denver's Union Station around 8:15am, and this stretch of Moffat Tunnel Sub heads almost due east, providing an opportunity for a well-lit morning sh... (more)

UPY 625 (GP15-1) gathers a cut of freight cars in the UP's North Yard in Denver, Colorado.

A variety of engines wait in the Union Pacific's North Yard in Denver for assignments or servicing.

BNSF 8539 (SD70ACe) leads a coal train through Keenesburg, Colorado at sunrise.