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Home
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Union Pacific Railroad Company
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Locomotives
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Alco 4-6-6-4
> UP 3931
Pictures of UP 3931
Owner:
Union Pacific Railroad Company
Model:
Alco 4-6-6-4
Built As:
UP 3931 (4-6-6-4)
Serial Number:
68940
Order No:
S-1779
Frame Number:
22X32 cylinders, 69" drivers
Built:
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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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:
1223
Comments:
0
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