Union Pacific's Big Boy 4014 (4-8-8-4) runs under the signal tower as it enters the yard after a trial run in preparation for the cross-country trip.

Union Pacific Big Boy #4014 (4-8-8-4) runs south on the Greeley Sub through Carr, Colorado and will end the day in Denver.

UP Big Boy #4014 (4-8-8-4) makes smoke as it heads south through Speer, Wyoming on its way to Denver, Colorado.

The Union Pacific Steam Team attend to UP Big Boy locomotive #4014 (4-8-8-4) as it will soon head from Denver, Colorado to its home base in Cheyenne, Wyoming.

Smoke Deflectors A new look for the Big Boy as it carries 3985’s old smoke deflectors on a quick run to Denver on September 30.

Smoke Deflectors A new look for the Big Boy as it carries 3985’s old smoke deflectors on a quick run to Denver on September 30.

Union Pacific's Big Boy #4014 (4-8-8-4) runs over the South Platte River in Denver, Colorado as it makes its second run of the season.

Natural Habitats 4014 in it’s indigenous territory climbs west for Sherman Hill during testing.

After traveling down from Cheyenne and unloading passengers, the 4014 and train are making a move over the Belt Line to tie up in North Yard. First, they have to move west along the Moffat Tunnel... (more)

A "chalk-free" Big Boy leads a passenger special to Denver in order to be in place for a run during what would have been the annual Denver Post CFD run. The noise leaving Cheyenne was p... (more)

When UP announced the singular trip for #4014 this year would be south to Denver on a Thursday, north to Cheyenne on a Saturday, right around the middle of July....all I could think of was the old... (more)

Union Pacific's Big Boy #4014 runs through the elevated curve at Speer, Wyoming as it runs backwards towards the steam shop in Cheyenne.

Sometimes things just work out, in this case me being in Texas for UP's steam specials. Odd that at 46 years old, my first ever photograph of UP steam would be the Big Boy!

The Big Boy heading down the IHB mainline in LaGrange as an EB BNSF stack train passes above on the Racetrack.

The Big Boy making its waited appearance in the small town of Grant Park, Illinois, on the Villa Grove Sub. Many people gathered along the tracks to see this historic steam engine pass by.