Was the Allegheny more powerful than Big Boy?

N&W, of course, didn't have to cover a profit to its Roanoke Shops). The 2-6-6-6 carried nearly as much weight on its trailer truck as the total engine weight of a Southern class Ks 2-8-0, and N&W's entire class M 4-8-0 weighed only about three tons more. So the Allegheny did, indeed, beat the A's horsepower figure.



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The trend toward size and power culminated in the 1.2 million pound, 6,200 horsepower 4-8-8-4 Big Boy. 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.

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World's most powerful electric locomotive Shen24 by CRRC for coal cargo service in China. China: The 28.8 MW 24-axle six-section locomotive develops starting tractive effort of 2,280 and continuous tractive effort of 1,596 kN reaching 120 km/h. Its official operation began in June 2021.

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The Union Pacific Centennial is the largest and most powerful diesel locomotive 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.

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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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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.

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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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In 1934, Flying Scotsman achieved the first authenticated 100 mph (161 km/h) by a steam locomotive.

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Union Pacific's Big Boy is the world's largest operational steam engine - YouTube.

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With a power output of 12,000 hp, the WAG 12 is twice as powerful as its immediate predecessor, WAG-9, making it one of the most powerful freight locomotives in the world.

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