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Union Pacific 9000 Class
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The Union Pacific Railroad 9000 Class is a class of 88 steam locomotives, built by ALCO for the Union Pacific between 1926 and 1930.
The prototype, UP 9000, as preserved at the Los Angeles County Fairplex in Pomona, California.
The prototype, UP 9000, as preserved at the Los Angeles County Fairplex in Pomona, California.
Front view of the same locomotive. The third cylinder and the mechanism that controls it can be seen below the smokebox.
Front view of the same locomotive. The third cylinder and the mechanism that controls it can be seen below the smokebox.
Whyte notation
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The Whyte notation is a classification method for locomotives based on wheel arrangement. While the Whyte notation is most commonly used when referring to steam locomotives, it can also be applied to
Union Pacific 9000 Class
…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. Under the Whyte notation for the classification of steam locomotives, 4-12-2 represents the wheel arrangement of four leading wheels, twelve coupled driving wheels, and two…
Whyte notation from a handbook for railroad industry workers published in 1906
Whyte notation from a handbook for railroad industry workers published in 1906