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It is generally regarded the Union Pacific (UP) Big Boys where the largest steam locomotives. They had a 4-8-8-4 wheel arrangement, with a overall length of 132 ft 9 1⁄4 in (40.47 m), and a total weight of 1,250,000 lb (762,000 lb locomotive, 342,200 lb tender). They had a traction effort of 135,375 lbf and a adhesion factor of 4.1, and burned coal. It last ran in July of 1959.
There is some disagreement on the size, there where other locomotives with higher wheel arrangements, but these were not as heavy or as powerful. UP holds the claim though that their Big Boy was the largest.
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