BNSF 6542 (ES44C4) and six other lead units hold on a siding at Tolland, Colorado so that an eastbound BNSF freight can proceed to Denver.

UP 2001, a SD70M painted in a special scheme for the 2001 Salt Lake City Winter Olympics, crosses a road in Fort Lupton, Colorado.

A pair of UP motors arrive at the yard in LaSalle, Colorado, ready to take a train somewhere on the Greeley Sub.

UP 1144, a former Cotton Belt GP60E, waits at the fueling bay in the UP's North Yard.

Among the power in the Union Pacific's North Yard is UP 1865, a SD40N that started life in 1977 as a SD40-2 for the UP.

The California Zephyr had two private cars attached as it arrived in Denver, Colorado.

Amtrak engine 71 leads the California Zephyr through Tolland, Colorado under some of the worse conditions imaginable. The temperature was around 23 degrees and the wind was blowing 50-60mph, insta... (more)

BNSF 2548 (GP39-3) leads an oil can train through West Tonville as it heads to Commerce City.

UP 8762 (SD70ACe) leads a freight through Greeley, Colorado on its way back to LaSalle.

With about 15 minutes before the sun crests the horizon UP 5797 (AC4400CW-CTE) exits Tunnel #1 at Plainview and drops down into Coal Creek Canyon.

Freezing fog and blowing snow during the blue hour made for slow going for BNSF 8205 (ES44C4) as it entered the town of Palmer Lake, Colorado.

UP 8762 (SD70ACe) gets ready to lash up to a string of sand cars which it will take from Eaton, Colorado to LaSalle.

UP 8687 (SD70ACe) leads a sand train past autoracks that are waiting on a siding near Brighton, Colorado.

This good looking switcher can be found working the fracking sand facility in Eaton, Colorado.

Amtrak 193 leads the California Zephyr #5 through a cut leading to Tunnel 1 at Plainview, Colorado.