1253:. In 1944, with the arrival of additional Challengers and the second order of Big Boys, their operating territory was expanded east from Green River to Cheyenne over the Wyoming Division's Fifth, Sixth, and Seventh Subs. Beginning in 1948, with Challenger locomotives taking over the bulk of service between Ogden and Green River, the Big Boys saw only occasional service on the Utah Division, while their operating territory was expanded to include the line south from Cheyenne to Denver. Between 1950 and 1957, they were occasionally assigned to handle trains east of Cheyenne to North Platte over the Nebraska Division's Third Sub. In the final years of steam on the UP, where the locomotives were only fired up to help with the fall rush traffic, the Big Boys saw service only between Cheyenne and Laramie.
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achieved by enlarging the
Challenger firebox to about 235 by 96 inches (5.97 m Ă— 2.44 m) (about 150 sq ft or 14 m), increasing boiler pressure to 300 psi (2.1 MPa), adding four driving wheels, and reducing the size of the driving wheels from 69 to 68 in (1,753 to 1,727 mm). 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
101:
1972:
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1957:, until 1984. Received cosmetic restoration, completed in 2021. Displayed outdoors because it is too large for Steamtown's turntable and roundhouse. Steamtown staff believe No. 4012 could be restored to working order, but recommended first determining whether surrounding rail infrastructure could handle the engine's weight. Surviving Tender No. 25-C-114 from UP 4013.
1111:
locomotive was converted back to coal in 1948. (Decades later, No. 4014 would be successfully converted to oil during its restoration.) Another experiment saw No. 4007 being modified with a single stack in
October 1948. The results were unsatisfactory, and the locomotive was reverted to double stack after testing. One final short-term experiment was the fitting of
2222:
1812:
36:
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when it jumped a switch track at 50 mph (80 km/h), throwing the engine onto its left side and derailing its tender and the first 18 freight cars of its 62-car train. The engineer and fireman were killed on impact; the brakeman died of severe burns in a hospital a few days later. The tender
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In 2019, the tender from
Challenger No. 3985, No. 25-C-311, was connected to Big Boy No. 4014 to save time in meeting the restoration deadline. The Railroading Heritage of Midwest America (RRHMA), which acquired No. 3985 in 2022, planned to rebuild No. 4014's original tender, No. 25-C-116, to carry
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No. 4005 converted to oil fuel in 1946 and reverted to coal in 1948. No. 4007 was modified with a single stack and tested in
October 1948. Results were unsatisfactory and locomotive reverted to double stack following tests. No. 4019 given experimental smoke deflectors from 1944 to 1945. No. 4014 in
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To achieve these new engineering goals, the
Challenger locomotive was "comprehensively redesigned from first principles", wrote locomotive historian Tom Morrison. The overall design simplified some aspects of previous locomotive designs and added complexity elsewhere. Compounding, booster, and feed
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A Union
Pacific design team led by Otto Jabelmann, the head of the Research and Mechanical Standards section of the Union Pacific's Mechanical Department, worked with ALCO (the American Locomotive Company) to re-examine their Challenger locomotives. The team found that the railroad's goals could be
1264:
to evaluate Big Boy performance. Several test runs were made on the
Evanston Subdivision from Ogden to Evanston (76 miles), and it was found that a Big Boy could consume 11 tons of coal and 12,000 gallons of water an hour operating at full throttle, producing 6,290 drawbar horsepower at 41.4 mph.
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A few experiments were carried out on the Big Boys during their years in revenue service. One experiment saw the conversion of No. 4005 to oil fuel in 1946. Unlike a similar effort with the
Challengers, the conversion failed due to uneven heating in the Big Boy's large, single-burner firebox. The
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design, although lacking the compounding of the Mallet. 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. Peak drawbar horsepower was reached at about 41 mph (66 km/h). The maximum drawbar
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system. The two exceptions were the 1.14% eastbound gradient between Ogden and
Evanston and the 1.55% westbound gradient between Cheyenne and Sherman Hill. In 1953, the latter grade was alleviated by the opening of Track 3 via Harriman, whose 0.82% grade theoretically allowed a Big Boy to haul a
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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
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power, spelled the end of their operational lives. They were among the last steam locomotives withdrawn from service on the Union
Pacific. The last revenue train hauled by a Big Boy ended its run early in the morning on July 21, 1959. Most were stored in operational condition until 1961; four
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Upon their arrival on Union Pacific property in 1941, the Big Boys were assigned to the Utah Division's First Sub, between Ogden and Green River, which included the 1.14% grade for which they were designed. From February 1943 to November of the same year, three Big Boys were assigned to the
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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 H-8s, under close scrutiny by the builder and the railroad, found them to be about half a ton less than 772,250 lb (350,290 kg).
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The locomotives were held in high regard by crews, who found them sure-footed and more “user friendly” than other motive power. They were capable machines, and their rated hauling tonnage was increased several times over the years (see section on tonnage ratings).
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The American Locomotive Company manufactured 25 Big Boy locomotives for Union Pacific: 20 in 1941 and five in 1944. Along with the Challengers, the Big Boys arrived on the scene just as traffic was surging in preparation for American participation in
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and limited cut-off. But the "proliferation of valves and gauges on the backhead showed that running a Big Boy was an altogether more complicated and demanding task for the crew than running previous existing locomotives", Morrison wrote.
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in May 2019 at its new home in Cheyenne, Wyoming, as the largest, heaviest, and most powerful operational steam locomotive in the world. Surviving Tender No. 25-C-116 from UP 4015. Currently mated with Tender No. 25-C-311 (taken from
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were no steeper than 0.82%. So for a majority of the route, Big Boys could handle trains of roughly 6,000 tons in either direction, limited only by the length of sidings and the locomotives' capacity to recharge the train's
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The 4-8-8-4 class series, originally rumored to be called the "Wasatch", after the Wasatch Mountains, acquired its nickname after an unknown ALCO worker scrawled "Big Boy" in chalk on the front of No. 4000's
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3409:"Steamtown National Historic Site's Union Pacific "Big Boy" No. 4012 Removed From Public Display For Cosmetic Restoration and Painting - Steamtown National Historic Site (U.S. National Park Service)"
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destroyed the cab of the locomotive, and the loads from the 18 derailed cars were scattered. The locomotive was repaired by Union Pacific at its Cheyenne facility and returned to service until 1962.
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1119:, as well as some of their Challengers. These were later removed, as the Big Boys' nozzle and blower in the smoke box could blow smoke high enough to keep engineers’ lines of sight clear.
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and helper operations, which slowed service. Union Pacific therefore decided to design a new locomotive that could handle the run by itself: faster and more powerful than the compound
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is 0.82% in either direction, but the climb eastward from Ogden, into the Wasatch Range, reached 1.14%. Hauling a 3,600-short-ton (3,300 t; 3,200-long-ton) freight train demanded
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The only surviving Big Boy from the second group built in 1944, and the only Big Boy known to have been moved by highway. Surviving Tender No. 25-C-105 from UP 4004.
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over this subdivision, the tests demonstrated that a Big Boy could handle 4,200 tons, running at an average speed of 18 to 20 mph between those two division points.
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fuel oil instead of coal. Once rebuilt, the tender is to be reconnected with No. 4014, and the No. 25-C-311 tender is to be reconnected to the No. 3985 locomotive.
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1990:
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To receive a cosmetic restoration. Traveled 1,064,625 miles in freight operation, farther than any other Big Boy. Surviving Tender No. 25-C-104 from UP 4003.
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Displayed in a climate-controlled shed. An impromptu attempt to bring the locomotive to steam in 1970 was reportedy attempted by visiting rail crew from the
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967:: four-wheel leading truck for stability entering curves, two sets of eight driving wheels and a four-wheel trailing truck to support the large
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Wrecked on April 27, 1953 and repaired afterwards. Donated to the museum in June 1970. Surviving Tender late model 25-C-4, unknown number.
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Most of the 25 Big Boys were scrapped, but seven remain on static display—two indoors and five outdoors, under the elements—and an eighth,
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Big Boys saw limited use on the line between Cheyenne and North Platte (in part because they were too long for the turntable in N Platte).
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supplied by Union Pacific-owned mines in Wyoming. Coal was carried from the tender to the firebox by a Standard Stoker Company type MB
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978:, was re-acquired by Union Pacific, and between 2014 and 2019 was rebuilt to operating condition for the 150th anniversary of the
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3068:"World's largest locomotive coming to West Chicago to celebrate 150th anniversary of Transcontinental Railroad completion"
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short tons (25,000 lb) per hour. Water to the boiler was furnished by a Nathan type 4000C Automatic Restarting
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Today, eight Big Boys survive, with most on static display at museums across the United States. One of them,
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2030:
3830:
The Big Legacy of the Union Pacific Big Boy: Why Railfans Still Love the "World's Largest" Steam Locomotive
3521:
English: Tender Classification Plate 25-C-116 (UP 4014). Original plate number still intact after 72 years.
3015:
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1954:
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Tonnage rating from Cheyenne to Buford may be increased by 66.6% with the addition of a helper locomotive.
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982:. It thus regained the title as the largest and most powerful operating steam locomotive in the world.
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1300:. The locomotive was sent on a tour in celebration of the 150th anniversary of the completion of the
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Postwar increases in the price of coal and labor, along with the advent of efficient, cost-effective
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2037:, No. 4014 was re-acquired and restored to operational condition by Union Pacific, then placed in
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of 4.0. It was designed to travel smoothly and safely at 80 miles per hour (130 km/h).
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pull measured during 1943 tests was 138,200 lbf (615 kN) while starting a train.
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over the Wasatch Range between Green River and Ogden. For most of the route, the maximum
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2861:(Technical report). Union Pacific Railroad Company Research & Mechanical Standards.
1950:
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273:
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3297:"UNION PACIFIC RAILROAD COMPANY Eastern District Nebraska Division Special Rules No.9"
3277:"UNION PACIFIC RAILROAD COMPANY Eastern District Wyoming Division Special Rules No.15"
3255:"UNION PACIFIC RAILROAD COMPANY Eastern District Wyoming Division Special Rules No.14"
3233:"UNION PACIFIC RAILROAD COMPANY Eastern District Wyoming Division Special Rules No.13"
3211:"UNION PACIFIC RAILROAD COMPANY Eastern District Wyoming Division Special Rules No.12"
3189:"UNION PACIFIC RAILROAD COMPANY Eastern District Wyoming Division Special Rules No.11"
3167:"UNION PACIFIC RAILROAD COMPANY Eastern District Wyoming Division Special Rules No.10"
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3323:
3145:"UNION PACIFIC RAILROAD COMPANY Eastern District Wyoming Division Special Rules No.9"
3123:"UNION PACIFIC RAILROAD COMPANY Eastern District Wyoming Division Special Rules No.7"
3103:"UNION PACIFIC RAILROAD COMPANY Eastern District Wyoming Division Special Rules No.6"
2753:
2310:– The world's largest metre-gauge steam locomotive, operated by East African Railways
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Received a cosmetic restoration in 2018. Surviving Tender No. 25-C-103 from UP 4002.
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Publicity photo of Union Pacific Big Boy #4000, the first of the class, taken in 1941
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3619:"Original Big Boy tender to be restored by Railroading Heritage of Midwest America"
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6,290–7,000 hp (4,690–5,220 kW) @ 41 mph (66 km/h) (drawbar)
216:
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In 2019, Union Pacific completed the restoration of No. 4014 and placed it in
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652:
2650:"Refurbished 'Big Boy' locomotive weighs more than a fully loaded Boeing 747"
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rated for 12,500 gallons per hour on the right side and an Elesco T.P. 502
4285:
3676:. The Hill, Stroud Gloucestershire; United Kingdom: Amberley. p. 76.
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2207:, by rail on August 25, 2013. Surviving Tender No. 25-C-101 from UP 4000.
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On April 27, 1953, No. 4005 was pulling a freight train through southern
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Cost to build US$ 265,000 in 1941, equivalent to $ 5,489,457 in 2023
461:
3849:
Union Pacific's Big Boys: The Complete Story from History to Restoration
3587:
Union Pacific's Big Boys: The Complete Story from History to Restoration
2914:
Union Pacific's Big Boys, The complete story from history to restoration
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1618:, was rebuilt to operating condition by Union Pacific's steam program.
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6,000-ton train unassisted the entire 993 mi (1,598 km) from
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918:
198:
56:
Need to improve general formatting; suggest rewriting several sections.
3433:
Steam Over Scranton: Special History Study, American Steam Locomotives
2720:. Railroad Color History (1st ed.). Voyageur Press. p. 104.
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Moved to its current location from the museum's former location in
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3700:. Museum of the American Railroad. August 26, 2013. Archived from
1037:
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1211:
The Big Boy locomotives had large grates to burn the low-quality
3648:
1308:
Tonnage ratings over principal operating territories (1946-1959)
453:
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All tonnage ratings are in exclusion of the engine and tender.
29:
1549:
Tonnage Ratings Over Greeley Subdivision (Denver - Cheyenne)
1115:
on locomotive 4019, similar to those found on the railroad's
3698:"Big Boy Steam Locomotive Arrives at its New Home in Frisco"
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door, then under construction as the first of its class.
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2868:
2579:
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2394:
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Tonnage ratings may be reduced by 10% for fast freight.
3774:
Peck, C. B.; Combes, C. L.; et al., eds. (1950).
3346:"Cheyenne's Big Boy 4004 to shine in new paint July 9"
2598:
The American Steam Locomotive in the Twentieth Century
2557:
The American Steam Locomotive in the Twentieth Century
1092:. There was some speculation that the first series of
27:
Type of American simple articulated 4-8-8-4 locomotive
2488:"Railway Age, October 4, 1941: UP's "Big Boy" debuts"
2456:
Welsh, Joe; Boyd, Jim; Howes Jr., William F. (2006).
1241:
rated for 14,050 gallons per hour on the left side.
4212:
Steam locomotive wheel arrangements (Whyte notation)
2977:"The Big Boy leaves the shop and heads into history"
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2521:"Huge Big Boy steam locomotive coming back to life"
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3780:(Fourteenth ed.). New York: Simmons-Boardman.
3777:1950-52 Locomotive Cyclopedia of American Practice
2888:"Marklin 37994 Union Pacific "Big Boy" Steam Loco"
2848:
2846:
963:. They were the only locomotives to use a 4-8-8-4
3612:
3610:
2752:. Forney Museum of Transportation. Archived from
928:(ALCO) between 1941 and 1944 and operated by the
3649:"National Railroad Museum - Green Bay, WI 54304"
2819:
2817:
2815:
1265:Designed to haul 3,600 tons up the 1.14% ruling
5085:Standard gauge locomotives of the United States
2743:
2741:
2739:
2737:
2353:
3377:"The Forney Museum is worth getting around to"
3314:"DISASTER ON THE RAILS: The Wreck of the 4005"
935:The 25 Big Boy locomotives were built to haul
4196:
4063:
3899:
3880:(Union Pacific Documentary about the Big Boy)
3811:Bush, John E.; Ehernberger, James L. (1996).
2460:(1st ed.). MBI Publishing. p. 104.
2458:The American Railroad: Working for the Nation
951:. In the late 1940s, they were reassigned to
318:Overall: 117 ft 7 in (35.84 m)
8:
3422:
3420:
3418:
2625:
2623:
2621:
2481:
2479:
2477:
594:5,889 sq ft (547 m) (4884-1)
584:5,185 sq ft (482 m) (4884-1)
574:4,218 sq ft (392 m) (4884-1)
536:Elesco Type T.P. 502 Exhaust Steam Injector
3672:Hinchcliffe, Richard; Wagner, Bill (2023).
3539:: CS1 maint: numeric names: authors list (
2643:
2641:
1285:, until 1962. Their duties were assumed by
625:2,043 sq ft (190 m) (Type A)
623:2,466 sq ft (229 m) (Type E)
596:5,735 sq ft (533 m) (4884-2)
586:5,035 sq ft (468 m) (4884-2)
576:2,301 sq ft (214 m) (4884-2)
566:2,734 sq ft (254 m) (4884-2)
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811:
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174:
111:
3753:Guide to North American Steam Locomotives
3291:
3289:
3008:"UP steam crew has Big Boy ready to roll"
1984:Union Pacific Railroad, Cheyenne, Wyoming
564:967 sq ft (90 m) (4884-1)
554:704 sq ft (65 m) (4884-1)
79:Learn how and when to remove this message
3674:Flying Scotsman in America The 1970 Tour
3617:Kratville-Wrinn, Cate (April 28, 2022).
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1560:La Salle to Speer Junction (Northbound)
1547:
1462:Cheyenne to Hermosa via Harriman trk. 3
1438:
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1134:
1079:The Big Boys were articulated, like the
556:720 sq ft (67 m) (4884-2)
2583:
2451:
2449:
2447:
2398:
2346:
2325:
1063:water heaters were eliminated, as were
5075:Steam locomotives of the United States
5070:Railway locomotives introduced in 1941
3532:
2420:Glischinski, Steve (August 21, 2013).
1554:Speer Junction to Denver (Southbound)
1007:In 1936, Union Pacific introduced the
90:
3813:Union Pacific Steam Big Boy Portraits
3625:. Kalmbach Publishing. Archived from
3562:. Kalmbach Publishing. Archived from
2874:
2486:Vantuono, William C. (July 9, 2019).
1533:
1484:
1386:
1281:remained in operational condition at
7:
3832:(1st ed.). South Platte Press.
3556:"Union Pacific No. 3985's next stop"
2549:
2547:
999:The cab controls of No. 4005 at the
3038:"2019 Union Pacific Steam Schedule"
2948:Union Pacific: Volume II, 1894-1969
2790:"Where to find Big Boy locomotives"
895:Eight preserved, remainder scrapped
288:288 ft (88 m) radius/ 20°
5055:Union Pacific Railroad locomotives
3936:American Locomotive Company (ALCO)
3815:(1st ed.). Challenger Press.
3463:"Steamtown's Locomotives and Cars"
876:) operational in excursion service
25:
3969:Electro-Motive Division, GM (EMD)
3724:"Museum of the American Railroad"
3429:"Union Pacific Railroad No. 4012"
1824:National Museum of Transportation
955:, where they hauled freight over
872:Seven on static display and one (
790:135,375 lbf (602.18 kN)
494:Up to 12,000 US gal of water / hr
492:Up to 11 short tons of coal / hr
3851:(1st ed.). Kalmbach Media.
3789:(1st ed.). Voyageur Press.
3467:Steamtown National Historic Site
2788:Wrinn, Jim (February 15, 2018).
2220:
2140:
2060:
1970:
1900:Steamtown National Historic Site
1886:
1810:
1736:
1665:
1557:Denver to La Salle (Northbound)
1291:gas turbine-electric locomotives
1247:Los Angeles & Salt Lake Line
1219:that could supply slightly over
647:(603 mm Ă— 813 mm)
518:107 in (2,718 mm) (OD)
99:
34:
3728:Museum of the American Railroad
3375:King, Kat (September 4, 2009).
3352:. June 26, 2018. Archived from
3319:Forney Museum of Transportation
3076:. July 24, 2019. Archived from
2827:. Union Pacific. Archived from
2519:Elliott, Dan (April 15, 2014).
2154:Museum of the American Railroad
1447:Council Bluffs to Grand Island
1364:Grand Island to Council Bluffs
1312:Most grades on Union Pacific's
1302:First transcontinental railroad
980:first transcontinental railroad
932:in revenue service until 1962.
645:23.75 in Ă— 32 in
510:150 sq ft (14 m)
5065:Simple articulated locomotives
3489:"Union Pacific "Big Boy" 4014"
3006:Sweeney, Steve (May 4, 2019).
2685:King, Ed (February 15, 2018).
2356:, pp. 501, 519, 523, 545.
2007:41.129703000°N 104.813658000°W
1622:Surviving Big Boy locomotives
526:300 lbf/in (2.1 MPa)
1:
4015:4500 and 8500 hp Gas Turbines
3554:Wrinn, Jim (March 31, 2020).
2975:Scott, Ramsey (May 4, 2019).
2952:University of Minnesota Press
2422:"Big Boy story began in 1940"
2354:Peck, Combes & Augur 1950
1450:Grand Island to North Platte
1256:In April 1943, UP borrowed a
474:(25.4 t; 25.0 long tons)
3828:Reisdorff, James J. (2007).
2890:. Trainz.com. Archived from
2648:Gruver, Mead (May 8, 2019).
2554:Morrison, Tom (2018-07-10).
2303:Union Pacific Heritage Fleet
2012:41.129703000; -104.813658000
1750:Forney Transportation Museum
1343:Green River to Rock Springs
1136:Table of orders and numbers
1001:Forney Transportation Museum
581: • Tubes and flues
2630:Kratville, William (1972).
2029:Long displayed at Fairplex
926:American Locomotive Company
145:American Locomotive Company
54:. The specific problem is:
5101:
2687:"Big Boy versus Allegheny"
1440:Westbound Tonnage Ratings
1346:Rock Springs to Wamsutter
1330:Eastbound Tonnage Ratings
1249:and ran between Ogden and
1200:
1185:
1175:
1160:
1102:locomotives, built by the
772:60 mph (97 km/h)
591: • Total surface
278:42 in (1,067 mm)
268:68 in (1,727 mm)
5013:
4038:
4010:Steam turbine locomotives
3927:
3518:QBL1201713 (2008-06-14),
3302:. Union Pacific Railroad.
3282:. Union Pacific Railroad.
3260:. Union Pacific Railroad.
3238:. Union Pacific Railroad.
3216:. Union Pacific Railroad.
3194:. Union Pacific Railroad.
3172:. Union Pacific Railroad.
3150:. Union Pacific Railroad.
3128:. Union Pacific Railroad.
3108:. Union Pacific Railroad.
2634:. Kratville Publications.
1777:39.7770500°N 104.970500°W
1703:41.1367500°N 104.799833°W
1653:
1650:
1647:
1641:
1638:
1635:
1629:
1626:
1530:
1527:
1524:
1521:
1513:
1510:
1507:
1504:
1493:
1490:
1423:
1409:
1406:
1397:
1394:
1380:
1374:
1361:Cheyenne to Grand Island
903:
810:
759:
620: • Heating area
538:14,000 US gal/hr capacity
173:
119:
110:
98:
3653:National Railroad Museum
2298:Union Pacific FEF Series
2293:Union Pacific Challenger
2101:44.4840833°N 88.048639°W
2074:National Railroad Museum
1927:41.4074889°N 75.669667°W
1851:38.5721472°N 90.461111°W
733:Pneumatic, Schedule 8-ET
367:11 ft (3.35 m)
257:36 in (914 mm)
4925:Articulated locomotives
4915:2-4-4-2+2-8-8-2+2-4-4-2
4857:Articulated locomotives
4728:Articulated locomotives
4617:Articulated locomotives
3785:Solomon, Brian (2009).
3493:RailGiants Train Museum
3469:. National Park Service
2936:magazine, November 1958
2916:. Kalmbach Media. 2020.
2716:Solomon, Brian (2000).
2602:McFarland & Company
2258:41.232139°N 95.917806°W
2181:33.144513°N 96.833444°W
2031:RailGiants Train Museum
1782:39.7770500; -104.970500
1708:41.1367500; -104.799833
1474:Green River to Wasatch
1471:Rawlins to Green River
1453:North Platte to Sidney
1340:Wasatch to Green River
677:7 in (178 mm)
507: • Grate area
359: in (40.47 m)
343: in (25.99 m)
329:Locomotive: 85 ft
315: in (22.09 m)
301:Locomotive: 72 ft
5017:Other notation forms:
3751:Drury, George (2015).
2718:Union Pacific Railroad
2596:Morrison, Tom (2018).
2106:44.4840833; -88.048639
1955:Bellows Falls, Vermont
1932:41.4074889; -75.669667
1904:Scranton, Pennsylvania
1856:38.5721472; -90.461111
1239:exhaust steam injector
1051:
1004:
930:Union Pacific Railroad
824:Union Pacific Railroad
389: in (4.94 m)
4891:0-6-2+2-4-2-4-2+2-6-0
4002:General Electric (GE)
3437:National Park Service
3326:on September 24, 2018
2981:Wyoming Tribune Eagle
2946:Klein, Maury (2006).
2800:on September 28, 2018
2697:on September 28, 2018
2367:"Challenger No. 3985"
2263:41.232139; -95.917806
2186:33.144513; -96.833444
1349:Wamsutter to Rawlins
1104:Lima Locomotive Works
1041:
1015:) locomotives on its
998:
912:Union Pacific Big Boy
698: in (35 mm)
484:4884-2: 25,000 US gal
482:4884-1: 24,000 US gal
345:Overall: 132 ft
94:Union Pacific Big Boy
2756:on December 10, 2018
2655:The Associated Press
2604:. pp. 533–534.
2315:Notes and references
2078:Green Bay, Wisconsin
1324:Council Bluffs, Iowa
1283:Green River, Wyoming
1031:that UP tried after
949:Green River, Wyoming
924:manufactured by the
914:is a type of simple
715: in (6 mm)
551: • Firebox
445:4884-2: 1,208,750 lb
443:4884-1: 1,189,500 lb
61:improve this article
50:to meet Knowledge's
5080:Freight locomotives
5050:4-8-8-4 locomotives
4219:Single engine types
4078:Historic/preserved
3847:Wrinn, Jim (2020).
3585:Wrinn, Jim (2020).
3566:on January 17, 2021
2253: /
2176: /
2096: /
2002: /
1922: /
1846: /
1828:St. Louis, Missouri
1772: /
1698: /
1623:
1550:
1468:Laramie to Rawlins
1459:Cheyenne to Buford
1456:Sidney to Cheyenne
1441:
1358:Buford to Cheyenne
1352:Rawlins to Laramie
1331:
1137:
1094:Chesapeake and Ohio
1003:in Denver, Colorado
843:4000-4019 (4884-1)
764:Performance figures
4982:Geared locomotives
4908:2-10-10-10-10-10-2
4131:Diesel locomotives
3878:Last of the Giants
3443:on August 13, 2012
3427:Chappell, Gordon.
2825:"Big Boy No. 4014"
2236:, Omaha, Nebraska
2035:Pomona, California
1621:
1616:Union Pacific 4014
1548:
1465:Buford to Laramie
1439:
1355:Laramie to Buford
1329:
1287:diesel locomotives
1135:
1057:factor of adhesion
1052:
1005:
845:4020-4024 (4884-2)
571: • Flues
561: • Tubes
435:4884-2: 436,500 lb
433:4884-1: 427,500 lb
425:4884-2: 772,250 lb
423:4884-1: 762,000 lb
415:4884-2: 545,200 lb
413:4884-1: 540,000 lb
18:Union Pacific 4017
5037:
5036:
4178:
4177:
4171:
4159:
4147:
4122:
4109:
4092:Steam locomotives
4045:
4044:
3944:9000 class 4-12-2
3858:978-1-62700-792-4
3796:978-0-7603-3338-9
3766:978-1-62700-259-2
3704:on April 13, 2016
3683:978-1-3981-1521-7
3499:on April 27, 2019
3356:on April 14, 2019
3048:on April 30, 2019
2961:978-0-8166-4460-5
2611:978-1-4766-6582-5
2467:978-0-7603-1631-3
2284:
2283:
2039:excursion service
1949:Was displayed at
1680:Cheyenne, Wyoming
1597:No. 4005 accident
1575:
1574:
1546:
1545:
1477:Wasatch to Ogden
1437:
1436:
1337:Ogden to Wasatch
1298:excursion service
1204:
1203:
1179:excursion service
1081:Mallet locomotive
965:wheel arrangement
953:Cheyenne, Wyoming
908:
907:
899:
898:
855:(revenue service)
806:
805:
755:
754:
610: • Type
401:4884-2: 68,150 lb
399:4884-1: 67,500 lb
169:
168:
89:
88:
81:
52:quality standards
43:This article may
16:(Redirected from
5092:
5060:ALCO locomotives
4205:
4198:
4191:
4182:
4165:
4153:
4141:
4116:
4103:
4102:"Living Legend"
4072:
4065:
4058:
4049:
3908:
3901:
3894:
3885:
3862:
3843:
3824:
3800:
3787:Alco Locomotives
3781:
3770:
3755:(2nd ed.).
3738:
3737:
3735:
3734:
3720:
3714:
3713:
3711:
3709:
3694:
3688:
3687:
3669:
3663:
3662:
3660:
3659:
3645:
3639:
3638:
3636:
3634:
3614:
3605:
3604:
3589:(1st ed.).
3582:
3576:
3575:
3573:
3571:
3551:
3545:
3544:
3538:
3530:
3529:
3528:
3515:
3509:
3508:
3506:
3504:
3495:. Archived from
3485:
3479:
3478:
3476:
3474:
3459:
3453:
3452:
3450:
3448:
3439:. Archived from
3424:
3413:
3412:
3405:
3399:
3398:
3396:
3394:
3389:on July 27, 2019
3385:. Archived from
3372:
3366:
3365:
3363:
3361:
3342:
3336:
3335:
3333:
3331:
3322:. Archived from
3310:
3304:
3303:
3301:
3293:
3284:
3283:
3281:
3273:
3262:
3261:
3259:
3251:
3240:
3239:
3237:
3229:
3218:
3217:
3215:
3207:
3196:
3195:
3193:
3185:
3174:
3173:
3171:
3163:
3152:
3151:
3149:
3141:
3130:
3129:
3127:
3119:
3110:
3109:
3107:
3099:
3090:
3089:
3087:
3085:
3080:on July 25, 2019
3064:
3058:
3057:
3055:
3053:
3044:. Archived from
3034:
3028:
3027:
3025:
3023:
3014:. Archived from
3003:
2997:
2996:
2994:
2992:
2983:. Archived from
2972:
2966:
2965:
2950:(2nd ed.).
2943:
2937:
2924:
2918:
2917:
2910:
2904:
2903:
2901:
2899:
2894:on July 11, 2019
2884:
2878:
2872:
2863:
2862:
2860:
2850:
2841:
2840:
2838:
2836:
2821:
2810:
2809:
2807:
2805:
2796:. Archived from
2785:
2766:
2765:
2763:
2761:
2745:
2732:
2731:
2713:
2707:
2706:
2704:
2702:
2693:. Archived from
2682:
2676:
2675:
2673:
2671:
2662:. Archived from
2645:
2636:
2635:
2627:
2616:
2615:
2600:(1st ed.).
2593:
2587:
2581:
2572:
2571:
2551:
2542:
2541:
2539:
2537:
2531:Associated Press
2516:
2510:
2509:
2507:
2505:
2500:on July 11, 2019
2496:. Archived from
2483:
2472:
2471:
2453:
2442:
2441:
2439:
2437:
2432:on June 24, 2018
2428:. Archived from
2417:
2402:
2396:
2387:
2386:
2384:
2382:
2373:. Archived from
2363:
2357:
2351:
2334:
2330:
2277:
2276:
2274:
2273:
2272:
2270:
2265:
2264:
2259:
2254:
2251:
2250:
2249:
2246:
2224:
2200:
2199:
2197:
2196:
2195:
2193:
2188:
2187:
2182:
2177:
2174:
2173:
2172:
2169:
2144:
2120:
2119:
2117:
2116:
2115:
2113:
2108:
2107:
2102:
2097:
2094:
2093:
2092:
2089:
2064:
2026:
2025:
2023:
2022:
2021:
2019:
2014:
2013:
2008:
2003:
2000:
1999:
1998:
1997:104°48′49.1688″W
1995:
1974:
1946:
1945:
1943:
1942:
1941:
1939:
1934:
1933:
1928:
1923:
1920:
1919:
1918:
1915:
1890:
1870:
1869:
1867:
1866:
1865:
1863:
1858:
1857:
1852:
1847:
1844:
1843:
1842:
1839:
1814:
1796:
1795:
1793:
1792:
1791:
1789:
1784:
1783:
1778:
1773:
1770:
1769:
1768:
1765:
1754:Denver, Colorado
1740:
1722:
1721:
1719:
1718:
1717:
1715:
1710:
1709:
1704:
1699:
1696:
1695:
1694:
1691:
1669:
1624:
1551:
1442:
1332:
1232:
1231:
1227:
1224:
1217:automatic stoker
1181:since May 2019.
1138:
1113:smoke deflectors
1065:Baker valve gear
961:Laramie, Wyoming
922:steam locomotive
856:
812:
761:
714:
713:
709:
697:
696:
692:
689:
613:Type E (4884-1)
543:Heating surface:
532:Feedwater heater
489:Fuel consumption
410:
388:
387:
383:
380:
358:
357:
353:
350:
342:
341:
337:
334:
314:
313:
309:
306:
247:
241:
237:
235:
234:
230:
227:
175:
162:
112:
103:
91:
84:
77:
73:
70:
64:
38:
37:
30:
21:
5100:
5099:
5095:
5094:
5093:
5091:
5090:
5089:
5040:
5039:
5038:
5033:
5009:
4976:
4927:
4919:
4896:2-6-6-2+2-6-6-2
4859:
4851:
4730:
4722:
4627:
4619:
4611:
4549:
4540:
4214:
4209:
4179:
4174:
4125:
4086:
4076:
4046:
4041:
4034:
3996:
3963:
3930:
3923:
3912:
3869:
3859:
3846:
3840:
3827:
3810:
3807:
3805:Further reading
3797:
3784:
3773:
3767:
3750:
3747:
3742:
3741:
3732:
3730:
3722:
3721:
3717:
3707:
3705:
3696:
3695:
3691:
3684:
3671:
3670:
3666:
3657:
3655:
3647:
3646:
3642:
3632:
3630:
3629:on May 13, 2022
3616:
3615:
3608:
3601:
3593:. p. 143.
3584:
3583:
3579:
3569:
3567:
3553:
3552:
3548:
3531:
3526:
3524:
3517:
3516:
3512:
3502:
3500:
3487:
3486:
3482:
3472:
3470:
3461:
3460:
3456:
3446:
3444:
3426:
3425:
3416:
3407:
3406:
3402:
3392:
3390:
3382:The Denver Post
3374:
3373:
3369:
3359:
3357:
3344:
3343:
3339:
3329:
3327:
3312:
3311:
3307:
3299:
3295:
3294:
3287:
3279:
3275:
3274:
3265:
3257:
3253:
3252:
3243:
3235:
3231:
3230:
3221:
3213:
3209:
3208:
3199:
3191:
3187:
3186:
3177:
3169:
3165:
3164:
3155:
3147:
3143:
3142:
3133:
3125:
3121:
3120:
3113:
3105:
3101:
3100:
3093:
3083:
3081:
3066:
3065:
3061:
3051:
3049:
3036:
3035:
3031:
3021:
3019:
3005:
3004:
3000:
2990:
2988:
2974:
2973:
2969:
2962:
2954:. p. 479.
2945:
2944:
2940:
2925:
2921:
2912:
2911:
2907:
2897:
2895:
2886:
2885:
2881:
2873:
2866:
2858:
2855:Report of Tests
2852:
2851:
2844:
2834:
2832:
2831:on May 17, 2019
2823:
2822:
2813:
2803:
2801:
2787:
2786:
2769:
2759:
2757:
2747:
2746:
2735:
2728:
2715:
2714:
2710:
2700:
2698:
2684:
2683:
2679:
2669:
2667:
2666:on June 8, 2019
2647:
2646:
2639:
2629:
2628:
2619:
2612:
2595:
2594:
2590:
2582:
2575:
2568:
2553:
2552:
2545:
2535:
2533:
2518:
2517:
2513:
2503:
2501:
2485:
2484:
2475:
2468:
2455:
2454:
2445:
2435:
2433:
2419:
2418:
2405:
2397:
2390:
2380:
2378:
2365:
2364:
2360:
2352:
2348:
2343:
2338:
2337:
2331:
2327:
2322:
2317:
2289:
2268:
2266:
2262:
2260:
2256:
2255:
2252:
2247:
2244:
2242:
2240:
2239:
2191:
2189:
2185:
2183:
2179:
2178:
2175:
2170:
2167:
2165:
2163:
2162:
2126:Flying Scotsman
2111:
2109:
2105:
2103:
2099:
2098:
2095:
2090:
2087:
2085:
2083:
2082:
2017:
2015:
2011:
2009:
2005:
2004:
2001:
1996:
1993:
1991:
1989:
1988:
1937:
1935:
1931:
1929:
1925:
1924:
1921:
1916:
1913:
1911:
1909:
1908:
1861:
1859:
1855:
1853:
1849:
1848:
1845:
1840:
1837:
1835:
1833:
1832:
1817:September 1941
1787:
1785:
1781:
1779:
1775:
1774:
1771:
1766:
1763:
1761:
1759:
1758:
1743:September 1941
1713:
1711:
1707:
1705:
1701:
1700:
1697:
1692:
1689:
1687:
1685:
1684:
1678:Holliday Park,
1672:September 1941
1612:
1599:
1580:
1310:
1278:diesel-electric
1258:dynamometer car
1229:
1225:
1222:
1220:
1213:bituminous coal
1209:
1125:
1100:H-8 “Allegheny”
993:
988:
854:
844:
801:
786:Tractive effort
711:
707:
706:
694:
690:
687:
685:
646:
624:
615:Type A (4884-2)
614:
602:
595:
585:
575:
565:
555:
537:
523:Boiler pressure
493:
483:
473:
444:
434:
424:
414:
408:Adhesive weight
406:
400:
385:
381:
378:
376:
355:
351:
348:
346:
344:
339:
335:
332:
330:
321:
311:
307:
304:
302:
243:
239:
232:
228:
225:
223:
222:4 ft
221:
184:
160:
115:Type and origin
106:
85:
74:
68:
65:
58:
39:
35:
28:
23:
22:
15:
12:
11:
5:
5098:
5096:
5088:
5087:
5082:
5077:
5072:
5067:
5062:
5057:
5052:
5042:
5041:
5035:
5034:
5032:
5031:
5026:
5021:
5014:
5011:
5010:
5008:
5007:
5002:
4997:
4992:
4986:
4984:
4978:
4977:
4975:
4974:
4969:
4963:
4962:
4957:
4952:
4946:
4945:
4940:
4934:
4932:
4921:
4920:
4918:
4917:
4911:
4910:
4905:
4899:
4898:
4893:
4888:
4882:
4881:
4876:
4870:
4868:
4853:
4852:
4850:
4849:
4843:
4842:
4837:
4832:
4827:
4822:
4817:
4812:
4806:
4805:
4800:
4795:
4790:
4785:
4780:
4775:
4770:
4765:
4759:
4758:
4753:
4748:
4743:
4737:
4735:
4724:
4723:
4721:
4720:
4715:
4710:
4705:
4700:
4694:
4693:
4688:
4683:
4678:
4673:
4668:
4663:
4657:
4656:
4651:
4646:
4641:
4635:
4633:
4613:
4612:
4610:
4609:
4604:
4599:
4594:
4589:
4583:
4582:
4577:
4572:
4567:
4562:
4556:
4554:
4542:
4541:
4539:
4538:
4532:
4531:
4526:
4521:
4516:
4511:
4505:
4504:
4499:
4494:
4489:
4484:
4479:
4474:
4468:
4467:
4462:
4457:
4452:
4447:
4442:
4437:
4432:
4427:
4422:
4417:
4412:
4407:
4401:
4400:
4395:
4390:
4385:
4380:
4375:
4370:
4365:
4360:
4355:
4350:
4344:
4343:
4338:
4333:
4328:
4323:
4318:
4313:
4308:
4303:
4298:
4293:
4288:
4283:
4277:
4276:
4269:
4268:
4263:
4258:
4253:
4248:
4243:
4238:
4233:
4228:
4222:
4220:
4216:
4215:
4210:
4208:
4207:
4200:
4193:
4185:
4176:
4175:
4173:
4172:
4160:
4148:
4135:
4133:
4127:
4126:
4124:
4123:
4110:
4096:
4094:
4088:
4087:
4077:
4075:
4074:
4067:
4060:
4052:
4043:
4042:
4039:
4036:
4035:
4033:
4032:
4027:
4022:
4017:
4012:
4006:
4004:
3998:
3997:
3995:
3994:
3989:
3984:
3979:
3973:
3971:
3965:
3964:
3962:
3961:
3956:
3951:
3946:
3940:
3938:
3932:
3931:
3928:
3925:
3924:
3913:
3911:
3910:
3903:
3896:
3888:
3882:
3881:
3875:
3868:
3867:External links
3865:
3864:
3863:
3857:
3844:
3839:978-0942035735
3838:
3825:
3806:
3803:
3802:
3801:
3795:
3782:
3771:
3765:
3757:Kalmbach Media
3746:
3743:
3740:
3739:
3715:
3689:
3682:
3664:
3640:
3606:
3600:978-1627007924
3599:
3591:Kalmbach Books
3577:
3546:
3510:
3480:
3454:
3414:
3400:
3367:
3337:
3305:
3285:
3263:
3241:
3219:
3197:
3175:
3153:
3131:
3111:
3091:
3059:
3029:
3018:on May 6, 2019
2998:
2987:on May 4, 2019
2967:
2960:
2938:
2919:
2905:
2879:
2877:, p. 319.
2864:
2842:
2811:
2767:
2733:
2726:
2708:
2677:
2637:
2617:
2610:
2588:
2573:
2566:
2543:
2511:
2473:
2466:
2443:
2403:
2388:
2377:on May 1, 2019
2358:
2345:
2344:
2342:
2339:
2336:
2335:
2324:
2323:
2321:
2318:
2316:
2313:
2312:
2311:
2305:
2300:
2295:
2288:
2285:
2282:
2281:
2278:
2237:
2231:
2228:
2227:November 1944
2225:
2218:
2213:
2209:
2208:
2201:
2160:
2151:
2148:
2147:December 1941
2145:
2138:
2135:
2131:
2130:
2121:
2080:
2071:
2068:
2067:December 1941
2065:
2058:
2055:
2051:
2050:
2027:
1994:41°7′46.9308″N
1986:
1981:
1978:
1977:November 1941
1975:
1968:
1963:
1959:
1958:
1951:Steamtown, USA
1947:
1906:
1897:
1894:
1893:November 1941
1891:
1884:
1879:
1875:
1874:
1871:
1830:
1821:
1818:
1815:
1808:
1805:
1801:
1800:
1797:
1756:
1747:
1744:
1741:
1734:
1731:
1727:
1726:
1723:
1682:
1676:
1673:
1670:
1663:
1660:
1656:
1655:
1652:
1649:
1646:
1640:
1637:
1634:
1628:
1611:
1608:
1598:
1595:
1594:
1593:
1590:
1587:
1584:
1579:
1576:
1573:
1572:
1569:
1566:
1562:
1561:
1558:
1555:
1544:
1543:
1540:
1536:
1535:
1532:
1529:
1526:
1523:
1520:
1516:
1515:
1512:
1509:
1506:
1503:
1499:
1498:
1495:
1492:
1489:
1486:
1483:
1479:
1478:
1475:
1472:
1469:
1466:
1463:
1460:
1457:
1454:
1451:
1448:
1445:
1435:
1434:
1431:
1428:
1425:
1422:
1419:
1416:
1412:
1411:
1408:
1405:
1402:
1399:
1396:
1393:
1389:
1388:
1385:
1382:
1379:
1376:
1373:
1370:
1366:
1365:
1362:
1359:
1356:
1353:
1350:
1347:
1344:
1341:
1338:
1335:
1314:Overland Route
1309:
1306:
1208:
1205:
1202:
1201:
1199:
1196:
1193:
1190:
1187:
1183:
1182:
1174:
1171:
1168:
1165:
1162:
1158:
1157:
1154:
1151:
1148:
1145:
1142:
1124:
1121:
1046:of No. 4014's
1025:double heading
992:
989:
987:
984:
906:
905:
901:
900:
897:
896:
893:
889:
888:
882:
878:
877:
870:
866:
865:
862:
858:
857:
853:June 21, 1959
851:
847:
846:
841:
837:
836:
835:4884-1, 4884-2
833:
827:
826:
821:
817:
816:
808:
807:
804:
803:
798:
796:Factor of adh.
792:
791:
788:
782:
781:
778:
774:
773:
770:
766:
765:
757:
756:
753:
752:
749:
748:Safety systems
745:
744:
741:
735:
734:
731:
725:
724:
721:
717:
716:
704:
700:
699:
683:
679:
678:
675:
671:
670:
665:
661:
660:
655:
649:
648:
643:
637:
636:
633:
627:
626:
621:
617:
616:
611:
607:
606:
603:
598:
597:
592:
588:
587:
582:
578:
577:
572:
568:
567:
562:
558:
557:
552:
548:
547:
544:
540:
539:
534:
528:
527:
524:
520:
519:
516:
512:
511:
508:
504:
503:
500:
496:
495:
490:
486:
485:
480:
476:
475:
470:
466:
465:
462:No. 5 fuel oil
451:
447:
446:
441:
437:
436:
431:
427:
426:
421:
417:
416:
411:
403:
402:
397:
391:
390:
373:
369:
368:
365:
361:
360:
327:
323:
322:
320:
319:
316:
298:
296:
290:
289:
286:
280:
279:
276:
270:
269:
266:
259:
258:
255:
249:
248:
245:standard gauge
219:
213:
212:
209:
202:
201:
196:
189:
188:
185:
183:Configuration:
180:
179:
178:Specifications
171:
170:
167:
166:
163:
161:Total produced
157:
156:
153:
149:
148:
142:
138:
137:
136:Otto Jabelmann
134:
130:
129:
126:
122:
121:
117:
116:
108:
107:
104:
96:
95:
87:
86:
42:
40:
33:
26:
24:
14:
13:
10:
9:
6:
4:
3:
2:
5097:
5086:
5083:
5081:
5078:
5076:
5073:
5071:
5068:
5066:
5063:
5061:
5058:
5056:
5053:
5051:
5048:
5047:
5045:
5030:
5027:
5025:
5022:
5020:
5016:
5015:
5012:
5006:
5003:
5001:
4998:
4996:
4993:
4991:
4988:
4987:
4985:
4983:
4979:
4973:
4970:
4968:
4965:
4964:
4961:
4958:
4956:
4953:
4951:
4948:
4947:
4944:
4941:
4939:
4936:
4935:
4933:
4930:
4926:
4922:
4916:
4913:
4912:
4909:
4906:
4904:
4903:2-8-8-8-8-8-2
4901:
4900:
4897:
4894:
4892:
4889:
4887:
4884:
4883:
4880:
4877:
4875:
4872:
4871:
4869:
4866:
4862:
4858:
4854:
4848:
4845:
4844:
4841:
4838:
4836:
4833:
4831:
4828:
4826:
4823:
4821:
4818:
4816:
4813:
4811:
4808:
4807:
4804:
4801:
4799:
4796:
4794:
4791:
4789:
4786:
4784:
4781:
4779:
4776:
4774:
4771:
4769:
4766:
4764:
4761:
4760:
4757:
4754:
4752:
4749:
4747:
4744:
4742:
4739:
4738:
4736:
4733:
4729:
4725:
4719:
4716:
4714:
4711:
4709:
4706:
4704:
4701:
4699:
4696:
4695:
4692:
4689:
4687:
4684:
4682:
4679:
4677:
4674:
4672:
4669:
4667:
4664:
4662:
4659:
4658:
4655:
4652:
4650:
4647:
4645:
4642:
4640:
4637:
4636:
4634:
4631:
4626:
4622:
4618:
4614:
4608:
4605:
4603:
4600:
4598:
4595:
4593:
4590:
4588:
4585:
4584:
4581:
4578:
4576:
4573:
4571:
4568:
4566:
4563:
4561:
4558:
4557:
4555:
4552:
4547:
4546:Divided drive
4543:
4537:
4534:
4533:
4530:
4527:
4525:
4522:
4520:
4517:
4515:
4512:
4510:
4507:
4506:
4503:
4500:
4498:
4495:
4493:
4490:
4488:
4485:
4483:
4480:
4478:
4475:
4473:
4470:
4469:
4466:
4463:
4461:
4458:
4456:
4453:
4451:
4448:
4446:
4443:
4441:
4438:
4436:
4433:
4431:
4428:
4426:
4423:
4421:
4418:
4416:
4413:
4411:
4408:
4406:
4403:
4402:
4399:
4396:
4394:
4391:
4389:
4386:
4384:
4381:
4379:
4376:
4374:
4371:
4369:
4366:
4364:
4361:
4359:
4356:
4354:
4351:
4349:
4346:
4345:
4342:
4339:
4337:
4334:
4332:
4329:
4327:
4324:
4322:
4319:
4317:
4314:
4312:
4309:
4307:
4304:
4302:
4299:
4297:
4294:
4292:
4289:
4287:
4284:
4282:
4279:
4278:
4274:
4271:
4270:
4267:
4264:
4262:
4259:
4257:
4254:
4252:
4249:
4247:
4244:
4242:
4239:
4237:
4234:
4232:
4229:
4227:
4224:
4223:
4221:
4217:
4213:
4206:
4201:
4199:
4194:
4192:
4187:
4186:
4183:
4169:
4164:
4161:
4157:
4152:
4149:
4145:
4140:
4137:
4136:
4134:
4132:
4128:
4120:
4114:
4111:
4107:
4101:
4098:
4097:
4095:
4093:
4089:
4085:
4084:Union Pacific
4081:
4073:
4068:
4066:
4061:
4059:
4054:
4053:
4050:
4037:
4031:
4028:
4026:
4023:
4021:
4018:
4016:
4013:
4011:
4008:
4007:
4005:
4003:
3999:
3993:
3990:
3988:
3985:
3983:
3980:
3978:
3975:
3974:
3972:
3970:
3966:
3960:
3957:
3955:
3952:
3950:
3947:
3945:
3942:
3941:
3939:
3937:
3933:
3926:
3921:
3920:Union Pacific
3917:
3909:
3904:
3902:
3897:
3895:
3890:
3889:
3886:
3879:
3876:
3874:
3871:
3870:
3866:
3860:
3854:
3850:
3845:
3841:
3835:
3831:
3826:
3822:
3818:
3814:
3809:
3808:
3804:
3798:
3792:
3788:
3783:
3779:
3778:
3772:
3768:
3762:
3758:
3754:
3749:
3748:
3744:
3729:
3725:
3719:
3716:
3703:
3699:
3693:
3690:
3685:
3679:
3675:
3668:
3665:
3654:
3650:
3644:
3641:
3628:
3624:
3620:
3613:
3611:
3607:
3602:
3596:
3592:
3588:
3581:
3578:
3565:
3561:
3557:
3550:
3547:
3542:
3536:
3523:
3522:
3514:
3511:
3498:
3494:
3490:
3484:
3481:
3468:
3464:
3458:
3455:
3442:
3438:
3434:
3430:
3423:
3421:
3419:
3415:
3410:
3404:
3401:
3388:
3384:
3383:
3378:
3371:
3368:
3355:
3351:
3347:
3341:
3338:
3325:
3321:
3320:
3315:
3309:
3306:
3298:
3292:
3290:
3286:
3278:
3272:
3270:
3268:
3264:
3256:
3250:
3248:
3246:
3242:
3234:
3228:
3226:
3224:
3220:
3212:
3206:
3204:
3202:
3198:
3190:
3184:
3182:
3180:
3176:
3168:
3162:
3160:
3158:
3154:
3146:
3140:
3138:
3136:
3132:
3124:
3118:
3116:
3112:
3104:
3098:
3096:
3092:
3079:
3075:
3074:
3069:
3063:
3060:
3047:
3043:
3042:Union Pacific
3039:
3033:
3030:
3017:
3013:
3009:
3002:
2999:
2986:
2982:
2978:
2971:
2968:
2963:
2957:
2953:
2949:
2942:
2939:
2935:
2934:
2929:
2926:Morgan, D.P.
2923:
2920:
2915:
2909:
2906:
2893:
2889:
2883:
2880:
2876:
2871:
2869:
2865:
2857:
2856:
2849:
2847:
2843:
2830:
2826:
2820:
2818:
2816:
2812:
2799:
2795:
2791:
2784:
2782:
2780:
2778:
2776:
2774:
2772:
2768:
2755:
2751:
2744:
2742:
2740:
2738:
2734:
2729:
2727:0-7603-0756-3
2723:
2719:
2712:
2709:
2696:
2692:
2688:
2681:
2678:
2665:
2661:
2657:
2656:
2651:
2644:
2642:
2638:
2633:
2626:
2624:
2622:
2618:
2613:
2607:
2603:
2599:
2592:
2589:
2586:, p. 75.
2585:
2580:
2578:
2574:
2569:
2567:9781476627939
2563:
2560:. McFarland.
2559:
2558:
2550:
2548:
2544:
2532:
2528:
2527:
2522:
2515:
2512:
2499:
2495:
2494:
2489:
2482:
2480:
2478:
2474:
2469:
2463:
2459:
2452:
2450:
2448:
2444:
2431:
2427:
2423:
2416:
2414:
2412:
2410:
2408:
2404:
2401:, p. 70.
2400:
2395:
2393:
2389:
2376:
2372:
2371:Union Pacific
2368:
2362:
2359:
2355:
2350:
2347:
2340:
2329:
2326:
2319:
2314:
2309:
2306:
2304:
2301:
2299:
2296:
2294:
2291:
2290:
2286:
2279:
2275:
2238:
2235:
2234:Kenefick Park
2232:
2229:
2226:
2223:
2219:
2217:
2214:
2211:
2210:
2206:
2205:Dallas, Texas
2202:
2198:
2161:
2159:
2158:Frisco, Texas
2155:
2152:
2149:
2146:
2143:
2139:
2136:
2133:
2132:
2128:
2127:
2122:
2118:
2091:088°02′55.1″W
2088:44°29′02.70″N
2081:
2079:
2075:
2072:
2069:
2066:
2063:
2059:
2056:
2053:
2052:
2048:
2045:
2044:UP Challenger
2040:
2036:
2032:
2028:
2024:
1987:
1985:
1982:
1979:
1976:
1973:
1969:
1967:
1964:
1961:
1960:
1956:
1952:
1948:
1944:
1917:075°40′10.8″W
1914:41°24′26.96″N
1907:
1905:
1901:
1898:
1895:
1892:
1889:
1885:
1883:
1880:
1877:
1876:
1872:
1868:
1841:090°27′40.0″W
1838:38°34′19.73″N
1831:
1829:
1825:
1822:
1819:
1816:
1813:
1809:
1806:
1803:
1802:
1798:
1794:
1767:104°58′13.8″W
1764:39°46′37.38″N
1757:
1755:
1751:
1748:
1745:
1742:
1739:
1735:
1732:
1729:
1728:
1724:
1720:
1693:104°47′59.4″W
1690:41°08′12.30″N
1683:
1681:
1677:
1674:
1671:
1668:
1664:
1661:
1658:
1657:
1645:
1633:
1625:
1619:
1617:
1609:
1607:
1604:
1596:
1591:
1588:
1585:
1582:
1581:
1577:
1570:
1567:
1564:
1563:
1559:
1556:
1553:
1552:
1541:
1538:
1537:
1518:
1517:
1501:
1500:
1496:
1487:
1481:
1480:
1476:
1473:
1470:
1467:
1464:
1461:
1458:
1455:
1452:
1449:
1446:
1444:
1443:
1432:
1429:
1426:
1420:
1417:
1414:
1413:
1403:
1400:
1391:
1390:
1383:
1377:
1371:
1368:
1367:
1363:
1360:
1357:
1354:
1351:
1348:
1345:
1342:
1339:
1336:
1334:
1333:
1327:
1325:
1320:
1315:
1307:
1305:
1303:
1299:
1294:
1292:
1288:
1284:
1279:
1274:
1270:
1268:
1263:
1259:
1254:
1252:
1251:Milford, Utah
1248:
1242:
1240:
1236:
1218:
1214:
1206:
1197:
1194:
1191:
1188:
1184:
1180:
1172:
1169:
1166:
1163:
1159:
1155:
1152:
1149:
1146:
1143:
1140:
1139:
1133:
1131:
1122:
1120:
1118:
1114:
1108:
1105:
1101:
1098:
1095:
1091:
1088:outweighed a
1085:
1082:
1077:
1075:
1069:
1066:
1060:
1058:
1049:
1045:
1040:
1036:
1034:
1030:
1026:
1022:
1018:
1014:
1010:
1002:
997:
990:
985:
983:
981:
977:
972:
970:
966:
962:
958:
954:
950:
946:
942:
941:Wasatch Range
938:
933:
931:
927:
923:
920:
917:
913:
902:
894:
890:
887:; May 1, 2019
886:
883:
879:
875:
871:
867:
863:
859:
852:
848:
842:
838:
834:
832:
828:
825:
822:
818:
813:
809:
802:4.02 (4884-2)
800:3.99 (4884-1)
799:
797:
793:
789:
787:
783:
779:
775:
771:
769:Maximum speed
767:
762:
758:
750:
746:
742:
740:
736:
732:
730:
726:
722:
720:Train heating
718:
705:
701:
684:
680:
676:
672:
669:
668:Piston valves
666:
662:
659:
656:
654:
650:
644:
642:
641:Cylinder size
638:
634:
632:
628:
622:
618:
612:
608:
604:
599:
593:
589:
583:
579:
573:
569:
563:
559:
553:
549:
545:
541:
535:
533:
529:
525:
521:
517:
513:
509:
505:
501:
497:
491:
487:
481:
477:
472:28 short tons
471:
469:Fuel capacity
467:
463:
460:converted to
459:
455:
452:
448:
442:
438:
432:
430:Tender weight
428:
422:
418:
412:
409:
404:
398:
396:
392:
374:
370:
366:
362:
328:
324:
317:
300:
299:
297:
295:
291:
287:
285:
284:Minimum curve
281:
277:
275:
274:Trailing dia.
271:
267:
264:
260:
256:
254:
250:
246:
240:1,435 mm
220:
218:
214:
210:
208:
205: •
203:
200:
197:
195:
192: •
190:
186:
181:
176:
172:
164:
158:
155:1941 and 1944
154:
150:
146:
143:
139:
135:
131:
127:
123:
118:
113:
109:
102:
97:
92:
83:
80:
72:
62:
57:
53:
49:
48:
41:
32:
31:
19:
4553:engine types
3953:
3848:
3829:
3812:
3786:
3776:
3752:
3731:. Retrieved
3727:
3718:
3706:. Retrieved
3702:the original
3692:
3673:
3667:
3656:. Retrieved
3652:
3643:
3631:. Retrieved
3627:the original
3622:
3586:
3580:
3568:. Retrieved
3564:the original
3559:
3549:
3525:, retrieved
3520:
3513:
3501:. Retrieved
3497:the original
3483:
3471:. Retrieved
3466:
3457:
3445:. Retrieved
3441:the original
3432:
3403:
3391:. Retrieved
3387:the original
3380:
3370:
3358:. Retrieved
3354:the original
3349:
3340:
3328:. Retrieved
3324:the original
3317:
3308:
3082:. Retrieved
3078:the original
3071:
3062:
3050:. Retrieved
3046:the original
3041:
3032:
3020:. Retrieved
3016:the original
3011:
3001:
2989:. Retrieved
2985:the original
2980:
2970:
2947:
2941:
2931:
2927:
2922:
2913:
2908:
2896:. Retrieved
2892:the original
2882:
2854:
2833:. Retrieved
2829:the original
2802:. Retrieved
2798:the original
2793:
2758:. Retrieved
2754:the original
2717:
2711:
2699:. Retrieved
2695:the original
2690:
2680:
2668:. Retrieved
2664:the original
2653:
2631:
2597:
2591:
2584:Solomon 2009
2556:
2534:. Retrieved
2524:
2514:
2502:. Retrieved
2498:the original
2491:
2457:
2434:. Retrieved
2430:the original
2425:
2399:Solomon 2009
2379:. Retrieved
2375:the original
2370:
2361:
2349:
2328:
2308:EAR 59 class
2269:Big Boy 4023
2248:095°55′4.1″W
2245:41°13′55.7″N
2192:Big Boy 4018
2124:
2112:Big Boy 4017
2018:Big Boy 4014
1938:Big Boy 4012
1862:Big Boy 4006
1788:Big Boy 4005
1714:Big Boy 4004
1651:Coordinates
1643:
1631:
1613:
1610:Preservation
1600:
1326:, to Ogden.
1311:
1295:
1275:
1271:
1255:
1243:
1210:
1192:72777–72781
1167:69571-69590
1147:Serial Nos.
1130:World War II
1126:
1123:Construction
1109:
1086:
1078:
1070:
1061:
1053:
1048:running gear
1006:
973:
957:Sherman Hill
934:
911:
909:
777:Power output
739:Train brakes
674:Valve travel
601:Superheater:
440:Total weight
253:Leading dia.
211:(2′D)D2′ h4g
75:
66:
59:Please help
55:
44:
4886:2-8-8-8-8-2
4718:4-8-4+4-8-4
4713:4-8-2+2-8-4
4708:4-8-0+0-8-4
4703:2-8-2+2-8-2
4698:2-8-0+0-8-2
4691:4-6-4+4-6-4
4686:4-6-2+2-6-4
4681:4-6-0+0-6-4
4676:2-6-2+2-6-2
4671:2-6-0+0-6-2
4666:0-6-2+2-6-0
4661:0-6-0+0-6-0
4654:4-4-2+2-4-4
4649:2-4-2+2-4-2
4644:2-4-0+0-4-2
4639:0-4-0+0-4-0
4080:locomotives
3916:locomotives
2748:Frank, Al.
2526:Yahoo! News
2493:Railway Age
2261: /
2184: /
2104: /
2010: /
1930: /
1854: /
1780: /
1706: /
1639:Date built
1571:4,000 tons
1568:5,000 tons
1565:8,000 tons
1542:6,000 tons
1534:6,000 tons
1531:6,000 tons
1528:6,500 tons
1525:8,000 tons
1522:6,800 tons
1514:6,100 tons
1511:6,090 tons
1508:6,090 tons
1505:3,250 tons
1497:4,900 tons
1494:5,100 tons
1488:2,800 tons
1433:6,800 tons
1430:9,000 tons
1427:5,800 tons
1424:5,900 tons
1421:7,800 tons
1418:6,000 tons
1410:6,100 tons
1407:6,090 tons
1404:8,000 tons
1401:6,090 tons
1398:6,090 tons
1395:4,450 tons
1384:4,800 tons
1381:5,100 tons
1378:6,700 tons
1375:5,100 tons
1372:3,800 tons
1150:Year built
1033:World War I
945:Ogden, Utah
916:articulated
892:Disposition
751:Cab signals
658:Walschaerts
420:Loco weight
375:16 ft
63:if you can.
5044:Categories
5005:Willamette
4863:and other
4275:(monorail)
4115:"Big Boy"
3949:Challenger
3821:B0027ZOGLA
3745:References
3733:2022-11-20
3658:2022-11-20
3527:2022-11-23
2875:Drury 2015
2267: (
2190: (
2171:96°50′00″W
2168:33°08′40″N
2110: (
2016: (
1936: (
1860: (
1786: (
1712: (
1198:4020-4024
1173:4000-4019
1117:FEF Series
1090:Boeing 747
1009:Challenger
729:Loco brake
723:Steam heat
703:Valve lead
664:Valve type
653:Valve gear
479:Water cap.
152:Build date
125:Power type
120:Reference:
4879:2-8-8-8-4
4874:2-8-8-8-2
4865:Multiplex
4847:2-10-10-2
4082:owned by
3473:March 13,
3447:March 13,
2750:"Big Boy"
2660:USA Today
2536:April 15,
2341:Citations
1648:Location
1319:air brake
1262:AT&SF
1207:Operation
1144:Quantity
1017:main line
939:over the
869:Preserved
864:1959–1962
820:Operators
743:Pneumatic
682:Valve lap
631:Cylinders
450:Fuel type
395:Axle load
294:Wheelbase
4575:2-2-4-0T
4030:AC6000CW
3922:Railroad
3873:UP Steam
3708:July 28,
3570:June 24,
3535:citation
3503:July 13,
3393:July 27,
3360:July 12,
3330:June 14,
3084:July 25,
3052:July 25,
3022:July 30,
2991:July 30,
2898:July 11,
2804:June 16,
2760:July 27,
2701:July 11,
2670:June 12,
2504:July 11,
2436:July 11,
2287:See also
2047:No. 3985
1267:gradient
1235:injector
1074:smokebox
1044:close-up
1029:2-8-8-0s
976:No. 4014
943:between
885:No. 4014
881:Restored
874:No. 4014
850:Last run
605:
546:
502:
499:Firebox:
458:No. 4014
236: in
187:
133:Designer
69:May 2023
45:require
5000:Heisler
4960:0-6-4-0
4929:Engerth
4861:Triplex
4840:4-8-8-4
4835:4-8-8-2
4830:2-8-8-4
4825:2-8-8-2
4820:2-8-8-0
4815:0-8-8-0
4810:0-8-6-0
4803:4-6-6-4
4798:4-6-6-2
4793:4-4-6-2
4788:2-6-8-0
4783:2-6-6-6
4778:2-6-6-4
4773:2-6-6-2
4768:2-6-6-0
4763:0-6-6-0
4756:2-4-4-2
4751:2-4-4-0
4746:0-4-4-2
4741:0-4-4-0
4630:Garratt
4621:Fairlie
4607:4-6-4-4
4602:4-4-6-4
4597:6-4-4-6
4592:4-4-4-4
4587:2-4-6-2
4580:4-2-2-0
4570:2-2-2-2
4565:2-2-2-0
4560:0-2-2-0
4286:0-4-0+4
4119:4-8-8-4
3992:SD90MAC
3954:Big Boy
3918:of the
3633:May 16,
2928:Big Boy
2835:June 5,
2632:Big Boy
2381:May 23,
2212:4884-2
2134:4884-1
2054:4884-1
1962:4884-1
1878:4884-1
1804:4884-1
1730:4884-1
1659:4884-1
1644:number
1642:Serial
1632:Number
1603:Wyoming
1228:⁄
1186:4884-2
1161:4884-1
1153:UP No.
1097:2-6-6-6
1050:in 2019
1013:4-6-6-4
1011:-type (
986:History
969:firebox
937:freight
919:4-8-8-4
861:Retired
840:Numbers
710:⁄
693:⁄
384:⁄
354:⁄
338:⁄
310:⁄
231:⁄
199:4-8-8-4
141:Builder
47:cleanup
4995:Climax
4732:Mallet
4551:Duplex
4536:4-14-4
4529:4-12-2
4524:2-12-4
4519:2-12-2
4514:2-12-0
4509:0-12-0
4502:4-10-2
4497:4-10-0
4492:2-10-4
4487:2-10-2
4482:2-10-0
4477:0-10-2
4472:0-10-0
4415:0-8-4T
4383:2-6-6T
4363:0-6-6T
4321:2-4-6T
4316:2-4-4T
4301:0-4-6T
4296:0-4-4T
4261:4-2-4T
4246:2-2-4T
4040:
3987:DDA40X
3929:
3914:Giant
3855:
3836:
3819:
3793:
3763:
3680:
3623:Trains
3597:
3560:Trains
3350:Trains
3073:WLS-TV
3012:Trains
2958:
2933:Trains
2794:Trains
2724:
2691:Trains
2608:
2564:
2464:
2426:Trains
2230:72780
2150:69589
2070:69588
1980:69585
1896:69583
1820:69577
1746:69576
1675:69575
1654:Notes
1636:Image
1156:Notes
1141:Class
991:Design
947:, and
815:Career
515:Boiler
372:Height
326:Length
263:Driver
147:(ALCO)
5024:Swiss
4972:0-8-6
4967:0-8-4
4955:0-6-4
4950:2-6-4
4943:0-4-6
4938:0-4-4
4931:types
4867:types
4734:types
4632:types
4625:Meyer
4465:6-8-6
4460:4-8-6
4455:4-8-4
4450:4-8-2
4445:4-8-0
4440:2-8-6
4435:2-8-4
4430:2-8-2
4425:2-8-0
4420:0-8-6
4410:0-8-2
4405:0-8-0
4398:4-6-4
4393:4-6-2
4388:4-6-0
4378:2-6-4
4373:2-6-2
4368:2-6-0
4358:0-6-4
4353:0-6-2
4348:0-6-0
4341:4-4-6
4336:4-4-4
4331:4-4-2
4326:4-4-0
4311:2-4-2
4306:2-4-0
4291:0-4-2
4281:0-4-0
4273:0-3-0
4266:6-2-0
4256:4-2-2
4251:4-2-0
4241:2-2-2
4236:2-2-0
4231:0-2-4
4226:0-2-2
4106:4-8-4
3982:DD35A
3300:(PDF)
3280:(PDF)
3258:(PDF)
3236:(PDF)
3214:(PDF)
3192:(PDF)
3170:(PDF)
3148:(PDF)
3126:(PDF)
3106:(PDF)
2859:(PDF)
2320:Notes
2137:4018
2057:4017
1807:4006
1733:4005
1662:4004
1630:Road
1627:Type
1578:Notes
1539:1953
1519:1949
1502:1947
1482:1946
1415:1949
1392:1947
1369:1946
1260:from
1195:1944
1170:1941
1021:grade
831:Class
364:Width
217:Gauge
194:Whyte
128:Steam
4990:Shay
4628:and
4548:and
4163:963B
4113:4014
4025:U50C
3977:DD35
3959:C855
3853:ISBN
3834:ISBN
3817:ASIN
3791:ISBN
3761:ISBN
3710:2019
3678:ISBN
3635:2022
3595:ISBN
3572:2021
3541:link
3505:2019
3475:2012
3449:2012
3395:2019
3362:2019
3332:2019
3086:2019
3054:2019
3024:2019
2993:2019
2956:ISBN
2900:2019
2837:2019
2806:2019
2762:2019
2722:ISBN
2703:2019
2672:2019
2606:ISBN
2562:ISBN
2538:2014
2506:2019
2462:ISBN
2438:2019
2383:2019
2216:4023
1966:4014
1882:4012
1491:N/A
1485:N/A
1387:N/A
1289:and
910:The
454:Coal
265:dia.
5029:UIC
5019:AAR
4168:E9B
4156:E9A
4151:951
4144:E9A
4139:949
4100:844
4020:U50
2049:).
2033:in
1953:in
1164:20
959:to
207:UIC
5046::
4623:,
3759:.
3726:.
3651:.
3621:.
3609:^
3558:.
3537:}}
3533:{{
3491:.
3465:.
3435:.
3431:.
3417:^
3379:.
3348:.
3316:.
3288:^
3266:^
3244:^
3222:^
3200:^
3178:^
3156:^
3134:^
3114:^
3094:^
3070:.
3040:.
3010:.
2979:.
2867:^
2845:^
2814:^
2792:.
2770:^
2736:^
2689:.
2658:.
2652:.
2640:^
2620:^
2576:^
2546:^
2529:.
2523:.
2490:.
2476:^
2446:^
2424:.
2406:^
2391:^
2369:.
2156:,
2076:,
1902:,
1826:,
1752:,
1304:.
1293:.
1221:12
1189:5
1132:.
1042:A
971:.
242:)
165:25
4204:e
4197:t
4190:v
4170:)
4166:(
4158:)
4154:(
4146:)
4142:(
4121:)
4117:(
4108:)
4104:(
4071:e
4064:t
4057:v
3907:e
3900:t
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