What was the largest diesel locomotive ever built?

The Centennials were the largest diesel-electric locomotives ever built. Actually comprising two engines on one frame, they delivered 6,600 horsepower. Designed and built exclusively for Union Pacific Railroad, the units were named in honor of the railroad's centennial anniversary celebration in 1969.



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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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Thirteen DDA40Xs survive today. The following list details the surviving locomotives and their current owners. 6900 - Kenefick Park, Omaha, Nebraska. The first DDA40X built, it was moved to its current location on April 15, 2005.

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Currently, the most powerful diesel locomotive is the EMD DDA40X. This was essentially two GP40 type locomotives built on one frame, with a single cab, and massive 4 axle trucks. It had a roughly 6,600 HP rating.

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Alco PA Locomotives Arguably the most beautiful diesel locomotive ever built, sadly no Alco PAs were originally preserved. Today, one is under restoration.

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What is the most famous diesel locomotive in the history of railroading? Arguably, the classic Electro-Motive “F-unit” can lay claim to the title. The Electro-Motive “F-unit”: Born in the autumn of 1939, it would be produced, in eight different models, until 1960 and would number more than 7,500 strong.

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The world's first diesel-powered locomotive was operated in the summer of 1912 on the same line from Winterthur, but was not a commercial success.

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Puffing Billy is the world's oldest surviving steam locomotive, constructed in 1813–1814 by colliery viewer William Hedley, enginewright Jonathan Forster and blacksmith Timothy Hackworth for Christopher Blackett, the owner of Wylam Colliery near Newcastle upon Tyne, in the United Kingdom.

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The peak was recorded in 1990, with a total of about 66,000 locomotives and railcars. By 2005, the number of locomotives and railcars declined, reaching the lowest of 49,551 units. In 2019, locomotives and railcars stock amounted to around 65,000 units.

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  • From Newcastle to Nuremberg. The Adler (German for Eagle) was the first working steam locomotive used in Germany. ...
  • The first journey. The Adler's first official journey began at 9 am on 7 December 1835. ...
  • The Adler's trails. The Adler was sold in 1858. ...
  • A brand new replica.


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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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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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Usually 30 to 50 years but a diesel engine might be replaced by a more modern and efficient model after half that time. Likewise a locomotive's electronics can be upgraded, or adjustments to new signalling systems made.

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Intercity 125 The stalwart of the British rail network merits its place on the list by being the fastest diesel train in the world, a record it achieved in 1987 and still holds today for travelling at a speed of 148 mph. Development of the 125 started during the 1960's and the first train entered service in 1976.

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The locomotives weigh between 100 and 200 tons (91,000 and 181,000 kilograms) and are designed to tow passenger-train cars at speeds of up to 125 miles per hour (200 kph). Siemens' modern engines produce up to 4,200 horsepower, and the generator can turn this into almost 4,700 amps of electrical current.

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1 (originally named Active) is an early steam locomotive that was built in 1825 by the pioneering railway engineers George and Robert Stephenson at their manufacturing firm, Robert Stephenson and Company.

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1 hauled the first passenger train in New South Wales, Australia. It was built by Robert Stephenson and Company.

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Power plant capacity is far greater than any individual locomotive uses, so electric locomotives can have a higher power output than diesel locomotives and they can produce even higher short-term surge power for fast acceleration.

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If China is the largest exporter of rail technology in the world, its neighbour Japan is certainly the most technologically advanced manufacturer on the market. Having launched the first class of bullet trains in 1964, the country has continuously updated its models according to the latest technological advancements.

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New York Central's 20th Century Limited was dubbed “The Greatest Train Ever Made.”

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