They were built with a wide margin of reliability and safety, and normally operated well below 60 miles per hour (100 km/h) in freight service.
This steam locomotive was built with a 2-8-8-8-2 wheel arrangement.
 It was likely the heaviest steam locomotive ever built: the 772,250 lb (350,290 kg) engine and 436,500 lb (198,000 kg) tender together outweighed a Boeing 747.
The last revenue train hauled by a Big Boy ended its run early in the morning on July 21, 1959.
The only Big Boy known to have been moved by highway.
So just how large can steam locomotives get?
Relatively few Yellowstone locomotives were manufactured: only 72 in total, which were divided into five different classes.
 The locomotive was converted back to coal firing in 1948. Meet the … Rolling Stock, , The Big Boys were articulated, like the Mallet locomotive design, though lacking the compounding of the Mallet. Hauling a 3,600-short-ton (3,300 t; 3,200-long-ton) freight train demanded double headingand helper operations, which slowed service. The added weight resulted in the need for six-wheel leading and trailing trucks to provide extra pushing power.
In 1936, Union Pacific introduced the Challenger-type (4-6-6-4) locomotives on its main line over the Wasatch Range between Green River and Ogden.  Another short-term experiment was the fitting of smoke deflectors on locomotive 4019, similar to those found on the railroad’s FEF Series, as well as some of their Challengers.
The Yellowstone was the largest steam locomotive ever built. These locomotives were often extremely durable, with some of them even running to this day. ga. Selkirk/Texan 2-10-4 Project, 7.25" ga. "Robbie" 0-4-2 Tank
| Advertising Info, Full Size Railroad Items It retired from regular rail service back in 1959, but Norfolk & Western kept its steam locomotives highly active until the 1960’s. 4014 partially derailed, with two axles from one set of drive wheels falling into the gauge, while entering the yard at, This page was last edited on 2 October 2020, at 11:41.  It was designed to travel smoothly and safely at 80 miles per hour. , The Big Boy has the longest engine body of any reciprocating steam locomotive, longer than two buses. They were capable machines; their rated hauling tonnage was increased several times over the years. Union Pacific Railroad, Cheyenne, Wyoming, Moved to its current location from the museum's former location in.
The Challengers were originally designed for speedy freight service, but expanded their repertoire to occasionally include passenger transportation.  By contrast, No.
The final surviving Norfolk & Western Y-Class locomotive is now on display at the Virginia Museum of Transportation. 4020-4024), Seven on display and one (No. Signals, Signs, Parts, Although the Norfolk & Western Y-Class isn’t the largest steam locomotive, it was the strongest in the world while it was up and running. No. 2-C-1 locomotive, Marklin 5516 Today, eight Big Boys survive, with most on static display at museums across the country. Learn how and when to remove this template message, "Railway Age, October 4, 1941: UP's "Big Boy" debuts", "Huge Big Boy steam locomotive coming back to life", "Refurbished 'Big Boy' locomotive weighs more than a Boeing 747", "Marklin 37994 Union Pacific "Big Boy" Steam Loco", "The Big Boy leaves the shop and heads into history", "UP steam crew has Big Boy ready to roll", "World's largest locomotive coming to West Chicago to celebrate 150th anniversary of Transcontinental Railroad completion", "DISASTER ON THE RAILS: The Wreck of the 4005", "Big Boy Derailed On Way To Laramie, Back On Schedule", "Cheyenne's Big Boy 4004 to shine in new paint July 9", "The Forney Museum is worth getting around to", https://www.nps.gov/stea/learn/news/steamtown-national-historic-site-s-union-pacific-big-boy-no-4012-removed-from-public-display-for-cosmetic-restoration-and-painting.htm, National Railroad Museum, Green Bay, Wisconsin, "Big Boy Steam Locomotive Arrives at its New Home in Frisco", Museum of American Railroad, Frisco, Texas, https://en.wikipedia.org/w/index.php?title=Union_Pacific_Big_Boy&oldid=981451447, Standard gauge locomotives of the United States, Short description is different from Wikidata, Articles needing additional references from October 2013, All articles needing additional references, All articles with vague or ambiguous time, Vague or ambiguous time from November 2019, Creative Commons Attribution-ShareAlike License, Type E (Nos. the latest update of this page, 4.75" ga.
 The team found that Union Pacific's goals could be achieved by enlarging its firebox to about 235 by 96 inches (5.97 m × 2.44 m) (about 150 sq ft or 14 m2), increasing boiler pressure to 300 psi, adding four driving wheels, and reducing the size of the driving wheels from 69 to 68 in (1,753 to 1,727 mm) on a new engine. While the PRR’s static test plant verified 7,987 horsepower after testing, some people argue that the impressive PRR Q2 actually reached a full 8,000 horsepower and was the most powerful locomotive to ever have been static tested. In 1919, the Midland Railway built a single 0-10-0 steam locomotive, No 2290 (later LMS (1947) 22290 and BR 58100 ). Railroads | Only one experimental XA Triplex was made for the Virginian Railway, and it’s unclear whether the railway actually wound up purchasing the locomotive from Baldwin. Today only eight Big Boys remain, mostly on display–except for the impressive restoration that you can see in the photo.
This locomotive was originally intended to be much lighter, but World War II resulted in light steel alloy restrictions alongside delaying the PRR S2’s construction schedule.
 The new locomotive was carefully designed not to exceed an axle loading of 67,800 lb (30,800 kg), and achieved the maximum possible starting tractive effort with a factor of adhesion of 4.0. Cars, Track, more, 7.5/2.5" scale With a 14-wheel build and the capacity to carry 25,000 gallons of water, the Union Pacific Challenger easily topped a million pounds in weight.
4005 was converted to burn oil in 1946.
Redwood Forest Steam Train DURATION | 75 mins Travel over trestles, through towering redwood groves and up a winding narrow-gauge grade to the summit of Bear Mountain as conductors narrate the history of Roaring Camp, the railroad and the forest. For most of the route, the maximum grade is 0.82% in either direction, but the climb eastward from Ogden, into the Wasatch Range, reached 1.14%. #20 & Tender, We have lots of buyers that
4014 was successfully converted to oil during its restoration. It became known as "Big Bertha" or "Big Emma" by railwaymen and railway enthusiasts. , Class of 25 American simple articulated 4-8-8-4 locomotives.
Union Pacific’s project to rebuild the Big Boy was so ambitious that it was likened to resurrecting a T-Rex!
1/4 Mile of Track, 7.5" Little This astounding machine was so powerful that it could reach speeds of 50 MPH with a full 125 freight cars in tow! want your Train Stuff, 7.25" ga. Electric  There is some speculation that the first series of Chesapeake and Ohio 2-6-6-6 “Allegheny” locomotives, built by the Lima Locomotive Works in 1941, may have weighed as much as 778,200 lb (353,000 kg), exceeding the Big Boys, but subsequent re-weighs of early-production H8s, under close scrutiny by the builder and the railroad, found them to be less than 772,250 lb (350,290 kg)..
The experimental PRR S1 was completely unique in its construction and was aptly nicknamed “The Big Engine”.
4000-4019), Type A (Nos. Wagner Locos, Cars, Track, More, 7.5 / 2.5" scale Rio  Along with the Challengers, the Big Boys arrived on the scene just as traffic was surging in preparation for American participation in World War II.  So Union Pacific decided to design a new locomotive that could handle the run by itself: faster and more powerful than the compound 2-8-8-0s that UP tried after World War I, able to pull long trains at a sustained speed of 60 miles per hour (100 km/h) once past mountain grades. The Yellowstone also had an unusually short lifespan, often being retired after just 10 years of active use.
The sleek, Art Deco -style outer shell of the PRR S1 was designed by French-American industrial designer Raymond Loewy, whom you can see standing with his masterpiece in the photo. Events Calendar | Book Store
Note: Yakubov, Vladimir Photo - UP 4-8-8-4 "Big Boy" #4023, Kenefick Park, Omaha, NE.
The PRR S2 was able to successfully reach 97% mechanical efficiency, meaning that only 3% of the steam power was lost during propulsion.
This articulated locomotive was one of two 2-6-6-6 locomotives that claimed the joint title of most powerful reciprocating steam locomotives to ever have been built. Coles 0-4-0 Engine & Cars, 7.25" Locomotive, & Riding Car, Accucraft AL97-083A Canadian Royal Hudson, 7.5"
Engine, 1" scale 4-3/4" ga. Locomotive
Meet the Union Pacific Big Boy, a steam locomotive built to handle extremely heavy freight through the treacherous grades of the Wasatch Mountains. , The 4-8-8-4 class series, originally rumored to be called the "Wasatch", after the Wasatch Mountains, acquired its nickname after an unknown worker scrawled "Big Boy" in chalk on the front of No. Another of the PRR’s experimental steam locomotives, the PRR S2 utilized two direct-drive steam turbines–one each for forward and reverse motion.
Including 1.25 mi.
4005 was pulling a freight train through southern, On May 16, 2019, No. They were the only locomotives to use a 4-8-8-4 wheel arrangement: four-wheel leading truck for stability entering curves, two sets of eight driving wheels and a four-wheel trailing truck to support the large firebox. Traveled 1,064,625 miles in freight operation, farther than any other Big Boy. Weight: 604 short tons.
 The overall design simplified some aspects of previous locomotive designs and added complexity elsewhere. The Erie Railroad originally connected New York City with Lake Erie, and its construction was stalled several times as a result of financial troubles and slow, expensive labor. Steam-powered locomotives were the first type of locomotives built, ushering in a new industrialized era with promises of more efficient cargo hauling and passenger travel.
The Big Boy locomotives had large grates to burn the low-quality bituminous coal supplied by Union Pacific-owned mines in Wyoming. It was designed by James Anderson for banking duties on the Lickey Incline in Worcestershire (south of Birmingham), England. The locomotives were held in high regard by crews, who found them sure-footed and more “user friendly” than other motive power.
Train & Track, Complete 14" RR: 2
4000, then under construction as the first of its class.
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