What was the heaviest steam locomotive ever built?

Union Pacific No. 4014 is a Big Boy class steam locomotive having a 4-8-8-4 wheel arrangement. They are the heaviest single expansion steam locomotive ever built, weighing about 1,200,000 pounds.



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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 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.

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This powerful, aerodynamic masterpiece rocketed to 126mph in 1938, a steam speed record that was never surpassed.
  • The need for speed. Mallard is an A4 class locomotive designed by Sir Nigel Gresley. ...
  • Curator with a Camera. ...
  • About the designer. ...
  • How it came to us.


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In 1934, Scotsman was clocked at 100mph on a special test run—officially the first locomotive in the UK to reach that speed. The test run proved to the LNER's directors that steam power could provide high speeds, negating a plan for the company to use diesel power on its high-speed services.

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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.

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Steam locomotives can be more powerful than diesel locmotives depending upon the size, capacity, weight and other specifications of the different engines. Steam locos used coal and/ or fire wood to heat the water, and hence the amount of heat and steam generated would not be/ can't be even all the time.

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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.

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One of the most beautiful steam locomotives ever built, the S1 was designed by Raymond Loewe. Poor balancing caused wheel-spin and only one was ever built, for the Pennsylvania Railroad in 1939.

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The last meter-gauge and narrow-gauge steam locomotives in regular service were retired in 2000. After being withdrawn from service, most steam locomotives were scrapped, though some have been preserved in various railway museums. The only steam locomotives remaining in regular service are on India's heritage lines.

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The oldest surviving steam railway locomotive in the world is Puffing Billy, which was built in 1813/14 for Christopher Blackett, owner of Wylam Colliery, near Newcastle-upon-Tyne. In 1805 Blackett had held talks with Trevithick, who supplied him with drawings of a steam locomotive.

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The first Gresley class P2 No. 2001 was completed in 1934 by the London & North Eastern Railway (LNER) at its Doncaster works. It was the most powerful express passenger steam locomotive ever built for a British railway.

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West Somerset Railway - The longest Heritage Railway in England.

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On 30 November 1934 his Flying Scotsman, an A1 Pacific, was the first steam locomotive to officially exceed 100mph in passenger service, a speed exceeded by the A4 Mallard on 3 July 1938 at 126mph, a record that still stands.

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One of the most beautiful steam locomotives ever built, the S1 was designed by Raymond Loewe. Poor balancing caused wheel-spin and only one was ever built, for the Pennsylvania Railroad in 1939.

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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.

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