How many Big Boy locomotives are left?

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.



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Twenty-five Big Boys were built exclusively for Union Pacific Railroad, the first of which was delivered in 1941. 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.

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The last revenue train hauled by a Big Boy ended its run early in the morning on July 21, 1959. Most were stored operational until 1961; four remained in operational condition at Green River, Wyoming until 1962. Their duties were assumed by diesel locomotives and gas turbine-electric locomotives.

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Wyoming. The Big Boy locomotives weighed more than one million pounds and were 132 feet, 9 inches long. Stood on its end, one would be the equivalent of a 13-story building. Each one cost approximately $265,000 to build, or about $4.4 million in today's money.

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Union Pacific 4014 is a steam locomotive owned and operated by the Union Pacific (UP) as part of its heritage fleet. It is a four-cylinder simple articulated 4-8-8-4 Big Boy type built in 1941 by the American Locomotive Company (ALCO) at its Schenectady Locomotive Works.

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Jim Wrinn was quoted in USA Today as estimating the cost to restore the 4014 at roughly $4 million. If I remember correctly, Stephen Lee was the engineer on the 844 trip.

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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.

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The Big Boys were built for power. They did the work of three smaller engines, pulling 120-car, 3800 ton freight trains at forty miles per hour in the mountains of Utah and Wyoming. With power, though, comes weight - larger cylinders, pistons, drive rods, boiler and firebox.

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The Big Boy has the longest engine body of any reciprocating steam locomotive, longer than two 40-foot buses. They were also the heaviest reciprocating steam locomotives ever built; the combined weight of the 772,250 lb (350,290 kg) engine and 436,500 lb (198,000 kg) tender outweighed a Boeing 747.

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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.

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Twenty of the Berkshire type locomotives exist today: 2 from the Pere Marquette, 6 from the Nickel Plate Road and 12 of the C & O's 2-8-4 locomotives, which they called Kanawhas. There are also a number of tenders that were used on Berkshire type locomotives that have survived.

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The Big Boy No. 4014 steam locomotive rolled out of a Union Pacific restoration shop in Cheyenne for a big debut after five years of restoration. It then headed toward Utah as part of a yearlong tour to commemorate the Transcontinental Railroad's 150th anniversary.

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