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3/29/2024
 
 
 
 
 
Owner: Union Pacific Railroad Company
Model:Alco 4-6-6-4Built As:UP 3931 (4-6-6-4)
Serial Number:68940Order No:S-1779
Frame Number:22X32 cylinders, 69" driversBuilt:8/1937
Notes:Schenectady 08/1937, class CSA-2, re# to 3831(oil) in 04/44, retired 06/57
Other locos with this serial:  UP 3931(4-6-6-4)
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UP 4-6-6-4 #3931 - Union Pacific Challenger
Title:  UP 4-6-6-4 #3931 - Union Pacific Challenger
Description:  Beautiful original photo of the 1937 Alco built Challenger just recently delivered to Union Pacific when this photo was taken by an unknown photographer. Specifics - class CSA-2, 69" drivers, impressive 255 psi boiler pressure, 22x32" cylinders (4), massive engine weight of 566,950 lb, impressive tractive effort of 97,305 lb. Union Pacific eventually had 105 4-6-6-4 Challengers on their roster before falling to the diesel revolution. This locomotive was converted to burn oil in 1944, renumbered to 3831, retired in June 1957.
Photo Date:  8/1/1937  Upload Date: 3/4/2015 10:10:40 PM
Location:  Topeka, KS
Author:  Gary Everhart
Categories:  Roster,Yard,Steam,Action
Locomotives:  UP 3931(4-6-6-4)
Views:  1022   Comments: 0


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