All of the Big Boys were coal-burning, stoker-fired, designed to run 7,000 horsepower at 70 miles per hour. They have been lauded in the industry as the highest horsepower, heaviest, and longest steam locomotives ever built.
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On 3 July 1938, Mallard broke the world speed record for steam locomotives at 126 mph (203 km/h), which still stands today. Leading dia.
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.
Union Pacific reached out to EMD for more power, and the result was the behemoth EMD DDA40X. Often cited as both the largest and most powerful diesel-electric locomotive ever built, the 98-foot, 5-inch, 475,830-pound machine is staggering. The prime movers are a pair of EMD 16-645E3A diesels.
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.
While the average car engine has about 200 horsepower, locomotive engines typically range from 2,000 to 4,500 horsepower. Train operators rely on diesel power across the full range of rail power applications.