What was the heaviest train engine?

Big Boy No. 4014. Twenty-five Big Boys were built exclusively for Union Pacific Railroad, the first of which was delivered in 1941. The locomotives were 132 feet long and weighed 1.2 million pounds.



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It is generally agreed that the largest steam locomotives are the 4-8-8-4 'Big Boys', built by the American Locomotive Company in 1941-44. They are 39.852 m (130.74 ft) long and weigh 508.02 tonnes (1.12 million lb) with tenders.

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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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- YouTube. The Worlds largest diesel locomotive the Union Pacific DD40X #6936 is turned on the old turntable in Cheyenne, Wyoming. The locomotive was built in 1971, weighs 270 tons, and is rated at 6,600 horsepower. This is a active locomotive mostly pulling excursion trains with the Union Pacific #844.

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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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The world's longest and heaviest train operated on June 21, 2001, between Newman and Port Headland in Western Australia. The train operated 170 miles (274 km) with 682 loaded iron ore cars. The train weighed 99,734 tons and measured 4.57 miles (7.35 km) in length.

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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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The Wärtsilä RT-flex96C is a turbocharged, two-stroke reciprocating diesel engine designed to power large container ships and is the world's largest engine.

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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 Australian BHP Iron Ore is the longest train ever recorded in history at approximately 4.6 miles (7.353 km). In the Pilbara region of Western Australia, BHP owns and runs the Mount Newman railway. This is a private rail network designed to transport iron ore.

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Rail cars are far bigger than truck trailers What does that look like in terms of weight? Most rail cars can have a gross weight (the total weight of the load, including the weight of the rail car itself) of up to 286,000 pounds. Heavy axle rail cars can have a gross weight of up to 315,000 pounds.

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Hydrogen-powered fuel cells, combined with batteries to store electricity, would be a zero-emissions solution to replace the diesel-electric locomotive, Moslener says.

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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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As far as I'm aware, there's no legal limit. Passenger trains do not normally exceed 12 cars (around 900 feet, dependent on rolling stock type), but many are much shorter than this.

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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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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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It was on 30 November 1934 that Flying Scotsman achieved the first properly authenticated 100mph for a steam engine. This was while she was running between Leeds and London.

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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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