Union Pacific 9000 Class
Steam locomotive class
Union Pacific 9000 Class
The Union Pacific Railroad 9000 Class is a class of 88 4-12-2 "Union Pacific" type steam locomotives built by ALCO between 1926-1930, they have 3 cylinders. They were the largest steam locomotives fitted with Gresley conjugated valve gear licensed from the British London and North Eastern Railway. They were 102 feet in length, making them the largest rigid wheelbase locomotives ever built. But the inside cylinder made maintenance very expensive and the rigid wheelbase demanded gentle curves
Read on Wikipedia · Image Jeremy Thompson, CC BY 2.0
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