Union Pacific Challenger 3985 within the Union Pacific roundhouse at Cheyenne.

UP 3985 was one of the second versions of the Challenger. She was built in July, 1943 by ALCO and her design drew heavily on experience with the famous Big Boy locomotives. She has 69 inch drivers... (more)

UP3985 accelerates away from Eaton heading towards Denver.

UP 3985 was one of the second versions of the Challenger. She was built in July, 1943 by ALCO and her design drew heavily on experience with the famous Big Boy locomotives. She has 69 inch drivers... (more)

UP 3985 was one of the second versions of the Challenger. She was built in July, 1943 by ALCO and her design drew heavily on experience with the famous Big Boy locomotives. She has 69 inch drivers... (more)

UP 3985 was one of the second versions of the Challenger. She was built in July, 1943 by ALCO and her design drew heavily on experience with the famous Big Boy locomotives. She has 69 inch drivers... (more)

UP 3985 was one of the second versions of the Challenger. She was built in July, 1943 by ALCO and her design drew heavily on experience with the famous Big Boy locomotives. She has 69 inch drivers... (more)

UP 3985 was one of the second versions of the Challenger. She was built in July, 1943 by ALCO and her design drew heavily on experience with the famous Big Boy locomotives. She has 69 inch drivers... (more)

UP 3985 was one of the second versions of the Challenger. She was built in July, 1943 by ALCO and her design drew heavily on experience with the famous Big Boy locomotives. She has 69 inch drivers... (more)

UP 3985 picks up speed after departing the yard in East Saint Louis on it's way to Gorham, IL

UP 3985 crosses the Merimack River. In a fortunate twist of fate, the westbound steam special is running on the eastbound track, while an eastbound freight clears slowly on the far track.

A look inside the cab of UP 3985. Note that the firebox door cover is off.

Steam cloud shroud

UP 3985 Eases through Gibbon Neb.

UP 3985 rolls through Overton Neb.