What is the largest steam train in the US?

The Union Pacific locomotive, known as Big Boy 4014, is the largest locomotive ever constructed. It just rolled in to Southern California after a massive restoration project. Thousands of people welcomed the largest steam locomotive ever constructed as it made its way back to Southern California Wednesday.



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Portraits of Modern Steam The four-cylinder Argentina is the most efficient steam locomotive ever built.

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Flying Scotsman has been described as the world's most famous steam locomotive.

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Its girth requires a 4-8-8-4 wheel configuration to keep it rock-steady on the rails. With a puny 7,000 horsepower, Big Boys had a maximum tractive power of 135,375 pounds, all to pull huge loads of freight across steep grades in Utah's Wasatch Mountains and the Rockies.

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Of the eighteen built, three survive and are on display in Minnesota: No. 225 at Proctor, No. 227 at the Lake Superior Railroad Museum in Duluth and No. 229 at Two Harbors.

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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.

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The 7 Most Beautiful Train Rides On Earth
  • The Bernina Express, Switzerland. ...
  • Nevada Northern Railway, United States. ...
  • Pacific Surfliner, United States. ...
  • The Glacier Express, Switzerland. ...
  • Jacobite Steam Train, Scotland. ...
  • Kuranda Scenic Railway, Australia. ...
  • Napa Valley Wine Train, United States.


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Railfan & Railroad stated in 2022 that the only places on earth to see steam locomotives in revenue freight service are small switching operations in China, North Korea and Bosnia, but that these were sporadic at best. Tourist locomotives are still in regular use.

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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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The locomotive, as its ownership changed, remained in Darlington from 1857, in later years on display at the Head of Steam museum in Darlington, in the same building as Darlington's North Road station.

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West Coast Railways, operators of 'The Jacobite', provided the steam engine and carriages for the 'Hogwarts Express' as seen in the 'Harry Potter' films including 'The Philosopher's Stone' and others in this wonderful series of films. Some of the carriages of 'The Jacobite' are those used in the 'Harry Potter' films.

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