A Challenger making a run over Archer Hill. Looks like an extra passenger in the cab.

Challenger 3985 works a freight before she became famous.

A Challenger runs up Sherman Hill through fields of grass.

A double header consisting of a Challenger and a Big Boy, make a run for the hill. The first car has a wing load for an aircraft. Maybe some day we'll see something of the likes of this again.

Minutes after the passage of a big thunder storm, the City of Los Angeles steam special awaits departure from Salt Lake City for Ogden, Green River, and Cheyenne.

Union Pacific 3985 is a four-cylinder simple articulated 4-6-6-4 Challenger-type steam locomotive. It was built in 1943 by the American Locomotive Company of Schenectady, New York. The Challenger ... (more)

UP 3985 steams through Erda while leading the City of Los Angeles passenger special on May 26, 1994.

Union Pacific "Challenger" No. 3977 and DDA40X "Centennial" No. 6922 share the display at Cody Park in North Platte, Neb. No. 3977 is the only Challenger on public display -- t... (more)

UP 3985, UP 951, UP 963B, and UP 949 pull an 18 car passenger special through Lake Point traveling from Salt Lake City to Las Vegas on a stormy May 13, 1994 morning.

Union Pacific "Challenger" 4-6-6-4 3985 heads west through Victorville as it heads to Ontario, California, on May 15th, 1994.

Fireman Jack Wheelihan watches and converses (more like yells) with Engineer Steve Lee on Union Pacific Challenger No. 3985 as it approaches Egbert, Wyoming, on September 23, 2003. The train will ... (more)

Engineer Steve Lee is at the throttle of Union Pacific 4-6-6-4 No. 3985 as it approaches Tremain, Wyoming, on UP’s Yoder Subdivision, on September 23, 2003.

Union Pacific Challenger No. 3985 storms up Archer Hill east of Cheyenne, Wyoming, on the morning of September 23, 2003.

The children of Yoder, Wyoming, get out of class and spend a little time outside on a warm September 23, 2003, to view something rare traveling through the tiny town. Union Pacific Challenger No. ... (more)