The Union Pacific 9000 class was the only class of steam locomotives with a 4-12-2 wheel arrangement ever to be built, also the 9000 class was the largest rigid frame locomotive ever built.

Feb 22, 2025 · The idea behind the 4-12-2 wheel arrangement began in May of 1925 when Union Pacific took delivery of its first 4-10-2, #8000. The locomotive was built by Alco, who was attempting to perfect three-cylinder steam technology believing it would offer more power.

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The 4-10-2 locomotives were capable of slightly greater speed while being capable of pulling about 20% more tonnage. The Union Pacific wanted more and approached the American Locomotive Company about a design for a 4-12-2.

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The 4-12-2 was dubbed the 'Union Pacific' type and it namesake railroad was the only North American railroad to use it. The American Locomotive Company built eighty-eight of these fast freight locomotives for the Union Pacific Railroad.

The Union Pacific Type steam locomotive is a non-articulated steam locomotive that featured a 4-12-2 wheel arrangement. Only 88 of these locomotives were built.