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)