Big Boy No.4014 is the world's largest operating steam locomotive.
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Weighing in at 1.1 million pounds and measuring nearly half a football field in length, the “Big Boy” locomotives were designed to haul heavy freight for the Union Pacific railroad over the mountainous regions of Utah and Wyoming.
Of the eight remaining Big Boys in existence, No.4014 is the only one operating today. The Big Boys were about 133 feet long and weigh 1.2 million pounds. Because of their great length, the frames of the Big Boys are “hinged,” or articulated, to allow them to negotiate curves.
The class J-1 and J-3a Hudsons of 1927 had 79 inch drivers. They were fast, powerful, very well proportioned, good looking, and may have been the best known steam locomotive. Honorable Mentions: CMStP&P Class F7.
Twenty-five Big Boy locomotives were built for Union Pacific to haul freight over the steep grade of the Wasatch Mountain Range in Utah during World War II. Eight were preserved after the locomotive was retired six decades ago, but only Big Boy No.4014 is still in operation.
In PTC territory the diesel is part of safety measures. Like any other mainline steam locomotive that was built to burn coal but after leaving the locomotive's assembly plant or during a restoration to operating condition had it converted to burn fuel oil.
Each one cost approximately $265,000 to build, or about $4.4 million in today's money. In the railroad world, the Big Boys were known as 4-8-8-4 articulated type locomotives.
4014 restoration cost, but Wrinn estimated at least $4 million based on similar restorations. The result will be one of just six to eight steam engines still operational on mainline U.S. railroad tracks. “Living Legend” Northern No. 844 has remained in service since 1944.
What is the most famous diesel locomotive in the history of railroading? Arguably, the classic Electro-Motive “F-unit” can lay claim to the title. The Electro-Motive “F-unit”: Born in the autumn of 1939, it would be produced, in eight different models, until 1960 and would number more than 7,500 strong.