The Union Pacific Railroad 9000 Class is a class of 88 steam locomotives, built by ALCO for the Union Pacific between 1926 and 1930. == Wheel arrangement == The Union Pacific 9000 class was the only class of steam locomotives with a 4-12-2 wheel arrangement ever to be built, and was also the largest rigid frame locomotive ever built.
The Union Pacific Railroad 9000 Class is a class of 88 steam locomotives, built by ALCO for the Union Pacific between 1926 and 1930. == Wheel arrangement == The Union Pacific 9000 class was the only class of steam locomotives with a 4-12-2 wheel arrangement ever to be built, and was also the largest rigid frame locomotive ever built.
Source: Wikipedia "Union Pacific 9000 Class" · CC BY-SA 4.0
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