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Union Pacific "Big Boy" 4014
An articulated steam locomotive with a 4-8-8-4 wheel arrangement (four leading wheels, two separate sets of eight driving wheels, and four trailing wheels) and its tender
Union Pacific Big Boy No. 4014 passes through Keller, Texas, on August 13, 2021
Type and origin
References:[1][2][3]
Power typeSteam
DesignerOtto Jabelmann
BuilderAmerican Locomotive Company (ALCO)
Serial number69585
Build dateNovember 1941
Rebuild dateJuly 2016–May 2019
Specifications
Configuration:
​
 • Whyte4-8-8-4
 • UIC(2′D)D2′ h4
Gauge4 ft 8+1⁄2 in (1,435 mm) standard gauge
Leading dia.36 in (914 mm)
Driver dia.68 in (1,727 mm)
Trailing dia.42 in (1,067 mm)
Minimum curve288 ft (88 m) radius/ 20°
Wheelbase
  • Locomotive: 72 ft 5+1⁄2 in (22.09 m)
  • Overall: 117 ft 7 in (35.84 m)
Length
  • Locomotive: 85 ft 7.8 in (26.11 m)
  • Overall: 132 ft 9+7⁄8 in (40.48 m)
Width11 ft (3.35 m)
Height16 ft 2+1⁄2 in (4.94 m)
Axle load67,500 lb (30,617 kg)
Adhesive weight540,000 lb (244,940 kg)
Loco weight762,000 lb (345,637 kg)
Tender weight436,500 lb (197,993 kg)
Total weight1,198,500 lb (543,630 kg)
Tender type25-C
Fuel typeNo. 5 fuel oil, originally coal
Fuel capacityTotal: 6,450 US gal (24,400 L; 5,370 imp gal)
Usable: 6,100 US gal (23,000 L; 5,100 imp gal)
Water cap.25,000 US gal (95,000 L; 21,000 imp gal)
Sandbox cap.8,000 lb (3,629 kg)
Fuel consumption20 US gal/mi (oil)
200 US gal/mi (water)
Firebox:​
 • Grate area150 sq ft (grate removed in 2019)
Boiler95 in (2,400 mm)
Boiler pressure300 lbf/in2 (2.1 MPa)
Feedwater heaterElesco Type T.P. 502 Exhaust Steam Injector
14,000 US gal / hour capacity
Heating surface:​
 • Firebox704 sq ft (65 m2)
 • Tubes967 sq ft (90 m2)
 • Flues4,218 sq ft (392 m2)
 • Tubes and flues5,185 sq ft (482 m2)
 • Total surface5,889 sq ft (547 m2)
Superheater:
​
 • TypeType E
 • Heating area2,466 sq ft (229 m2)
CylindersFour, outside
Cylinder size24 in × 32 in (610 mm × 813 mm)
Valve gearWalschaerts
Valve typePiston valves
Valve travel7 in (178 mm)
Valve lap1+3⁄8 in (35 mm)
Valve lead1⁄4 in (6 mm)
Train heatingSteam heat
Loco brakePneumatic, Schedule 8-ET
Train brakesPneumatic
Safety systemsCab signals, PTC
Performance figures
Maximum speed80 mph (130 km/h)
Power output7,000 hp (5,200 kW) @ Cylinder
Tractive effort138,240 lb (62.7 t)
Factor of adh.3.91
Career
OperatorsUnion Pacific
Class4884-1[4]
Number in class15
Numbers
  • UP 4014
Nicknames"The Big Boy"
LocaleWestern United States
DeliveredDecember 1941
First runDecember 1941
Last runJuly 21, 1959
RetiredDecember 7, 1961
RestoredMay 1, 2019
Current ownerUnion Pacific Heritage Fleet
DispositionOperational

Union Pacific 4014, also known as the "Big Boy", is a steam locomotive owned and operated by the Union Pacific Railroad (UP) as part of their heritage fleet. It is a four-cylinder simple articulated 4-8-8-4 "Big Boy" type built in 1941 by the American Locomotive Company (ALCO) at its Schenectady Locomotive Works. It was assigned to haul heavy freight trains in the Wasatch mountain range. The locomotive was retired from revenue service in 1959 and was donated to the Railway and Locomotive Historical Society; thereafter, it was displayed in Fairplex at the RailGiants Train Museum in Pomona, California.

In 2013, UP re-acquired the locomotive and launched a restoration project at their Steam Shop in Cheyenne, Wyoming. In May 2019, No. 4014 moved under its own power for the first time after sitting dormant for almost six decades, becoming the world's largest operational steam locomotive and the only operating Big Boy locomotive of the eight that remain in existence. It now operates in excursion service for the UP steam program. No. 4014 became the first mainline steam locomotive to be equipped with the positive train control (PTC) system in 2021.

History

Design

Main article: Union Pacific Big Boy § Design
A close-up of one of the articulated steam locomotive's set of wheels
A close-up of No. 4014's running gear in 2019

The Big Boy class was developed by Union Pacific's (UP) chief mechanical officer Otto Jabelmann and built by the American Locomotive Company (ALCO) in the 1940s to handle the 1.14% eastbound ruling grade of the Wasatch Range.[5] Jabelmann determined that his goals for the new class could be achieved by making several changes to the existing 4-6-6-4 Challenger design: enlarging the firebox to about 235 by 96 inches (5.97 m × 2.44 m) (about 155 sq ft or 14.4 m2), lengthening the boiler, adding four driving wheels, and reducing the diameter of the driving wheels from 69 to 68 in (1,753 to 1,727 mm).[1][5]

The Big Boy was articulated like the Mallet locomotive design, although without compounding.[6] It was designed for stability at 80 miles per hour (130 km/h), allowing for a wide margin of reliability and safety, as steam locomotives normally operated well below that speed in freight service.[7] Peak horsepower was reached around 35 mph (56 km/h); optimal tractive effort was reached around 10 mph (16 km/h).[7] It is longer than two city buses and weighs more than a Boeing 747.[8]

Revenue service and retirement

An articulated steam locomotive on static display
UP No. 4014 on static display at the RailGiants Train Museum in Pomona, California, in 2005

ALCO built No. 4014 in November 1941 at a cost of $265,174 and delivered it the following month to Union Pacific, where it was placed in revenue service.[1][5] No. 4014 was part of the first group of 20 Big Boys, classified as 4884-1.[4] Designed to haul 3,600-short-ton (3,214-long-ton; 3,266 t) freight trains over Utah's Wasatch Range, No. 4014 and the other 24 Big Boys routinely pulled freight trains of up to 4,200 short tons (3,750 long tons; 3,810 t).[1] On April 2, 1943, it was trialed to pull 65 freight cars between Ogden, Utah, and Evanston, Wyoming, with a total of 5,530 hp (4,120 kW).[9] No. 4014's last routine repairs took place in 1956.[10]

No. 4014 completed its final revenue run on July 21, 1959, just hours before the last revenue run by any Big Boy.[1] It had traveled 1,031,205 miles (1,659,564 km) during its twenty years of revenue service.[1][5] Union Pacific retired No. 4014 on December 7, 1961.[7] All of the remaining Big Boys were retired by 1962, when their duties were taken over by diesel locomotives and gas turbine-electric locomotives (GTELs).[1][11] That same year, Union Pacific donated No. 4014 to the Southern California chapter of the Railway and Locomotive Historical Society in Pomona, California, where it became one of the eight Big Boys preserved around the United States.[7][12][a]

Ownership transfer

Two yellow diesel locomotives hauling an articulated steam locomotive, one at the front and the other at the back, through the mountains in the background
Union Pacific SD70Ms Nos. 4014 and 4884 haul Big Boy No. 4014 over the Cajon Pass to Cheyenne, Wyoming, for restoration.[13][b]

In late 2012, Union Pacific officials announced that they would obtain a Big Boy locomotive, restore it to operating condition, and use it in excursion service.[16]

On July 23, 2013, the Southern California chapter of the Railway and Locomotive Historical Society agreed to transfer ownership of No. 4014 back to Union Pacific.[17][c]

On November 14, 2013, No. 4014 began its journey to the UP Steam Shop in Cheyenne.[20][21] It was pulled from its display site at the museum, on temporary track, to the adjacent parking lot.[20][21] On January 26, 2014, No. 4014 was pulled from the Los Angeles County Fairplex to the Covina station on Metrolink trackage by No. 1996, an SD70ACe diesel locomotive painted in Southern Pacific colors.[22] It presently arrived at UP's West Colton Yard in Bloomington, California,[23] where it sat on display until April 28, when it began its journey to Cheyenne.[13] After arriving at the Steam Shop's roundhouse on May 8,[24] No. 4014 sat largely idle for two years while the UP steam crew worked to overhaul No. 844.[25][26] The Steam Shop also used the time to expand and upgrade its facilities to accommodate a Big Boy.[27]

Restoration

A steam locomotive driving wheel on the lathe
One of No. 4014's driving wheels on the lathe at the Strasburg Rail Road workshop in 2017

In August 2016, a month after No. 844's repairs and inspection were complete, UP officials announced that the restoration work of No. 4014 had begun under Heritage Fleet Operations director Ed Dickens.[28][29] By early 2017, the locomotive had been completely disassembled.[30] Some new parts were fabricated, including the rod brasses, top boiler check valve and lubricator check valves.[30] The driving wheels were sent to be repaired by the Strasburg Rail Road in Strasburg, Pennsylvania, for crankpin and axle work as well as installing new tires.[31][32]

The work included one major alteration: converting the coal-burning locomotive to run on No. 5 fuel oil.[7] This was done by replacing the firebox grates with a fire pan and an oil burner.[33] This made No. 4014 the first Big Boy to undergo a coal-to-oil conversion since No. 4005, which ran on oil from 1946 until it was converted back to coal in 1948 due to uneven heating in its large, single-burner firebox.[12][34] No. 4014's old firebox grates were salvaged and used on the Milwaukee Road 261 steam locomotive.[35]

In March 2018, it was reported that the process of putting the locomotive back together had begun;[33] ten months later, the locomotive's restoration was nearly finished.[36] In December 2018, Union Pacific asked the Federal Railroad Administration (FRA) to exempt UP Nos. 4014 and 844 from federal Positive Train Control (PTC) requirements;[37] in February 2019, the FRA officials responded that such waivers were not needed.[38] On February 6, 2019, No. 4014's boiler passed a hydrostatic test and the locomotive was successfully test-fired on April 9.[39][40][41] Around 9 p.m. on May 1, 2019, No. 4014 moved under its own power for the first time in almost 60 years.[42] The following evening, the locomotive made its first test run, from Cheyenne to Nunn, Colorado.[43]

Excursion service

Two steam locomotives double heading and surrounded by railfans in the foreground
UP No. 4014 and UP No. 844 depart Granger, Wyoming, bound for Evanston, Wyoming, and Ogden, Utah, on May 6, 2019

Upon the completion of the restoration, No. 4014 joined the railroad's never-retired No. 844 steam locomotive in excursion service.[44][45] No. 4014 also became the world's largest operational steam locomotive, displacing (and later replacing) No. 3985, which was in poor mechanical condition at the time No. 4014 was restored to operation.[46][d][e]

In May 2019, No. 4014 made its first excursion run amid the celebrations marking 150 years since the completion of the First transcontinental railroad.[32][52][53] Following its May 4 christening at the Cheyenne Depot Museum, No. 4014 — doubleheaded with No. 844 — traveled to Ogden, Utah.[53][54][55] No. 4014 subsequently made two tours on its own.[56][57] From July 8 to August 8, it visited the Midwestern United States,[56] including brief stops at Saint Paul Union Depot and the Lake Superior Railroad Museum;[58][59] it then toured the Southwestern United States from September 27 to November 26.[57]

Due to the COVID-19 pandemic, UP announced in March 2020 that it would cancel that year's steam operations with Nos. 4014 and 844.[60] Excursion operations resumed in August and September 2021 with No. 4014 doing tour stops in Fort Worth and Houston, Texas; New Orleans, Louisiana; North Little Rock, Arkansas; St. Louis, Missouri; and Denver, Colorado.[61] Also in 2021, No. 4014 became the first mainline steam locomotive to be equipped with new PTC equipment.[62][63]

On April 11, 2022, UP originally announced that No. 4014 would tour the Northwestern United States, starting on June 26 in commemoration of UP's 160th anniversary,[64] but the tour was cancelled on April 22 so UP could reduce supply chain congestion.[65] In late July, No. 4014 pulled the Museum Special excursion between Cheyenne and the Denver Union Station to benefit the Union Pacific Railroad Museum.[66][67]

See also

Notes

  1. ^ Surviving tender No. 25-C-116 was connected with 4014 and placed on display at Fairplex (RailGiants Train Museum) in Pomona, California. The tender was connected with No. 4014 for 55 years.
  2. ^ On April 10, 2019, the diesel locomotive numbered 4014 was redesignated as 4479 on the UP active locomotive roster, allowing the "Big Boy" to retain the number.[14][15]
  3. ^ On February 22, 2014, UP EMD SD40-2C No. 3105 (née Missouri Pacific No. 6027), UP insulated boxcar No. 453665, and bay window caboose UP No. 24567 (née Rock Island No. 17149) took No. 4014's place in the museum.[18][19]
  4. ^ In January 2020, Union Pacific officials announced that the UP Steam Team would operate just two steam locomotives—Nos. 844 and 4014—and would retire No. 3985, which was in poor mechanical condition.[46][47] In April 2022, UP announced that it would donate No. 3985 to the Railroading Heritage of Midwest America (RRHMA).[48][49]
  5. ^ No. 3985's original tender, No. 25-C-311, is connected to No. 4014 to meet the restoration deadline.[47][50] In May 2022, the RRHMA planned to rebuild No. 4014's original tender, No. 25-C-116, to carry fuel oil instead of coal.[51] Afterwards, it will eventually be reconnected with No. 4014 and the No. 25-C-311 tender will be reconnected to the No. 3985 locomotive.[51]

References

  1. ^ a b c d e f g "Union Pacific No. 4014" (PDF). RailGiants Train Museum. The Railway and Locomotive Historical Society, Southern California Chapter. August 2014. Archived from the original (PDF) on July 30, 2016. Retrieved April 30, 2019.
  2. ^ "Big Boy No. 4014" (PDF) (Press release). Union Pacific. Archived from the original (PDF) on August 30, 2016. Retrieved May 4, 2019.
  3. ^ C. B. Peck, ed. (1950). 1950–52 Locomotive Cyclopedia of American Practice. New York: Simmons-Boardman. pp. 522–523.
  4. ^ a b Drury, George H. (2015). Guide to North American Steam Locomotives (2nd ed.). Kalmbach Media. p. 319. ISBN 978-1-62700-259-2.
  5. ^ a b c d Glischinski, Steve (August 21, 2013). "Big Boy story began in 1940". Trains. Kalmbach Media. Archived from the original on October 25, 2021. Retrieved October 9, 2022.
  6. ^ Morrison, Tom (2019). The American Steam Locomotive in the Twentieth Century (1st ed.). McFarland & Company. pp. 533–534. ISBN 978-1-4766-6582-5.
  7. ^ a b c d e Vantuono, William C. (July 28, 2013). "UP: A return to steam for Big Boy 4014". Railway Age. Archived from the original on April 28, 2019. Retrieved April 28, 2019.
  8. ^ Gruver, Mead (May 8, 2019). "Refurbished 'Big Boy' locomotive weighs more than a Boeing 747". The Associated Press. USA Today. Archived from the original on June 8, 2019. Retrieved June 12, 2019.
  9. ^ Huddleston, Eugene L. (2001). World's Greatest Steam Locomotives: C&O 2-6-6-6, Virginian 2-6-6-6, N&W 2-6-6-4, UP 4-8-8-4 (1st ed.). TLC Publishing. pp. 71–73. ISBN 1-883089-60-3.
  10. ^ "Big Wheels Not Yet Turnin'". Community Ties. Union Pacific. August 15, 2013. Archived from the original on December 10, 2017. Retrieved May 5, 2019.
  11. ^ Klein, Maury (2006). Union Pacific: Volume II, 1894-1969 (2nd ed.). University of Minnesota Press. p. 479. ISBN 978-0-8166-4460-5.
  12. ^ a b Wrinn, Jim (February 15, 2018). "Where to find Big Boy locomotives". Trains. Kalmbach Media. Archived from the original on September 28, 2018. Retrieved June 12, 2019.
  13. ^ a b Forgione, Mary (April 28, 2014). "Big Boy's wheels to roll Monday on epic California-Wyoming journey". Los Angeles Times. Archived from the original on September 9, 2016. Retrieved April 30, 2019.
  14. ^ "Union Pacific to renumber SD70M No. 4014 before Big Boy runs". Trains. Kalmbach Media. June 27, 2018. Archived from the original on October 18, 2018. Retrieved April 28, 2019.
  15. ^ "Diesel No. 4014 gets new number ahead of Big Boy debut". Trains. Kalmbach Media. May 16, 2019. Archived from the original on May 28, 2019. Retrieved May 28, 2019.
  16. ^ "Union Pacific studying Big Boy restoration project". Trains. Kalmbach Media. December 7, 2012. Archived from the original on January 19, 2013. Retrieved April 27, 2019.
  17. ^ "Union Pacific Railroad Acquires Big Boy Locomotive No. 4014". Union Pacific. July 23, 2013. Archived from the original on June 24, 2018. Retrieved April 30, 2019.
  18. ^ "Union Pacific SD40-2C No. 3105". RailGiants Train Museum. Archived from the original on April 27, 2019. Retrieved April 28, 2019.
  19. ^ "UP No. 3105 Heads Home to RailGiants Museum". Community Ties. Union Pacific. February 21, 2014. Archived from the original on August 2, 2016. Retrieved May 1, 2019.
  20. ^ a b "Big Boy No. 4014 Prepares to Leave Pomona". Community Ties. Union Pacific. November 14, 2013. Archived from the original on May 30, 2017. Retrieved May 5, 2019.
  21. ^ a b Allen, David (November 14, 2013). "Big Boy lumbers to life at Pomona fairgrounds". Inland Valley Daily Bulletin. Archived from the original on June 7, 2019. Retrieved June 7, 2019.
  22. ^ "Fans Welcome Big Boy No. 4014's Return to the National Rail Network". Community Ties. Union Pacific. January 27, 2014. Archived from the original on May 1, 2019. Retrieved May 14, 2019.
  23. ^ "West Colton Yard" (PDF) (Press release). Union Pacific. Archived from the original (PDF) on June 6, 2019. Retrieved June 6, 2019.
  24. ^ Rader, Anna (May 8, 2014). "Union Pacific Big Boy 4014 Arrives In Cheyenne". Wyoming Public Media. Archived from the original on October 1, 2015. Retrieved April 30, 2019.
  25. ^ ""Living Legend" Northern No. 844". Union Pacific. Archived from the original on April 21, 2019. Retrieved May 3, 2019.
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  27. ^ "Work on Big Boy locomotive goes slowly". Omaha World-Herald. Associated Press. November 24, 2014. Archived from the original on July 1, 2019. Retrieved July 1, 2019.
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  29. ^ "Big Boy Work Begins". Trains. Kalmbach Media. August 12, 2016. Archived from the original on July 10, 2018. Retrieved April 28, 2019.
  30. ^ a b "Steam Update: With Disassembly Complete, Big Boy Fabrication Underway". Inside Track. Union Pacific. February 1, 2017. Archived from the original on August 22, 2017. Retrieved August 5, 2019.
  31. ^ "Progress report on Union Pacific Big Boy 4014". Trains. Kalmbach Media. March 3, 2018. Archived from the original on July 27, 2018. Retrieved May 4, 2019.
  32. ^ a b "Union Pacific confirms Big Boy 4-8-8-4 No. 4014 for Ogden in 2019 and more". Trains. Kalmbach Media. May 10, 2018. Archived from the original on October 18, 2018. Retrieved May 4, 2019.
  33. ^ a b "Putting the 'Big Boy' Back Together". Inside Track. Union Pacific. March 22, 2018. Archived from the original on September 17, 2018. Retrieved April 27, 2019.
  34. ^ Frank, Al. "Big Boy". Forney Museum of Transportation. Archived from the original on December 10, 2018. Retrieved July 27, 2019.
  35. ^ Glischinski, Steve (March 29, 2017). "Minnesota steam engine to use Big Boy fire grates". Trains. Kalmbach Media. Archived from the original on March 31, 2017. Retrieved August 5, 2019.
  36. ^ "Steam Update: Big Boy's Restoration Nearly Complete". Inside Track. Union Pacific. January 29, 2019. Archived from the original on April 27, 2019. Retrieved April 27, 2019.
  37. ^ "Big Boy 4014 gets drivers; UP asks for PTC waivers for three steam locomotives". Trains. Kalmbach Media. December 13, 2018. Archived from the original on June 8, 2019. Retrieved June 9, 2019.
  38. ^ Wrinn, Jim (February 28, 2019). "FRA: UP doesn't need waiver to run steam 11,000 miles in 2019". Trains. Kalmbach Media. Archived from the original on June 9, 2019. Retrieved June 9, 2019.
  39. ^ "'Big Boy' passes early pressure test". Trains. Kalmbach Media. February 6, 2019. Archived from the original on May 4, 2019. Retrieved June 27, 2019.
  40. ^ Wrinn, Jim (February 8, 2019). "Big Boy 4014, a hydrostatic test, and why UP can beat the usual six month rule". Trains. Kalmbach Media. Archived from the original on May 30, 2019. Retrieved May 30, 2019.
  41. ^ "Big Boy No. 4014 fired up for the first time; May 12 excursion announced". Trains. Kalmbach Media. April 10, 2019. Archived from the original on April 10, 2019. Retrieved April 16, 2019.
  42. ^ Wrinn, Jim (May 2, 2019). "Under its own power, Big Boy moves outside of shop". Trains. Kalmbach Media. Archived from the original on May 2, 2019. Retrieved May 2, 2019.
  43. ^ Wrinn, Jim (May 3, 2019). "Big Boy debuts with test run". Trains. Kalmbach Media. Archived from the original on May 3, 2019. Retrieved May 3, 2019.
  44. ^ Scott, Ramsey (May 4, 2019). "The Big Boy leaves the shop and heads into history". Wyoming Tribune Eagle. Archived from the original on May 4, 2019. Retrieved June 7, 2019.
  45. ^ Sweeney, Steve (May 4, 2019). "UP steam crew has Big Boy ready to roll". Trains. Kalmbach Media. Archived from the original on May 6, 2019. Retrieved July 17, 2019.
  46. ^ a b Keefe, Kevin (January 17, 2020). "The Challenger at high tide". Classic Trains. Kalmbach Media. Archived from the original on May 11, 2021. Retrieved June 23, 2021.
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  48. ^ "Railroading Heritage of Midwest America - official website". Railroading Heritage of Midwest America. Archived from the original on April 28, 2022. Retrieved May 2, 2022.
  49. ^ Glischinski, Steve (April 28, 2022). "Railroading Heritage of Midwest America, Union Pacific agree to donation of Challenger, other locomotives, cars". Trains. Kalmbach Media. Archived from the original on April 28, 2022. Retrieved May 2, 2022.
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  52. ^ "World's Largest Steam Locomotive Returns to the Rails as Union Pacific Commemorates Transcontinental Railroad's 150th Anniversary". Union Pacific. March 14, 2019. Archived from the original on May 2, 2019. Retrieved May 2, 2019.
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  54. ^ O'Donoghue, Amy (May 9, 2019). "Thousands turn out as Big Boy locomotive rolls into Ogden". Deseret News. Archived from the original on May 9, 2019. Retrieved May 12, 2019.
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  56. ^ a b "Union Pacific's Big Boy No. 4014 Locomotive Prepares for 'Great Race Across the Midwest'". Union Pacific. June 13, 2019. Archived from the original on July 8, 2019. Retrieved July 8, 2019.
  57. ^ a b "Union Pacific's Big Boy No. 4014 Locomotive Concludes 150th Anniversary Celebration with 'Great Race Across the Southwest'". Union Pacific. September 5, 2019. Archived from the original on September 6, 2019. Retrieved September 28, 2019.
  58. ^ Obert, Elizabeth (July 14, 2019). "Historic locomotive Big Boy No. 4014 rolls into St. Paul". St. Paul Pioneer Press. Archived from the original on May 11, 2021. Retrieved November 16, 2022.
  59. ^ "Festival of Steam with Big Boy No. 4014". Lake Superior Railroad Museum. Archived from the original on July 26, 2019. Retrieved March 7, 2021.
  60. ^ Bodiford, Vince (April 29, 2020). "Union Pacific Big Boy #4014 steam tour cancelled". The Cheyenne Post. Archived from the original on May 16, 2020. Retrieved May 23, 2021.
  61. ^ "Full Steam Ahead: World's Largest Steam Locomotive Returns with 'The Big Boy 2021 Tour'". Union Pacific. June 14, 2021. Archived from the original on June 14, 2021. Retrieved June 17, 2021.
  62. ^ "Big Boy Flexes Its Muscles with Positive Train Control". Inside Track. Union Pacific. August 19, 2021. Archived from the original on August 20, 2021. Retrieved August 20, 2021.
  63. ^ "UP 4014 First Main Line Steam Locomotive Outfitted With PTC". Railfan & Railroad. White River Productions. August 20, 2021. Archived from the original on August 20, 2021. Retrieved October 14, 2022.
  64. ^ "World's Largest Steam Locomotive 'Big Boy No. 4014' Returns to the Tracks to Celebrate 160 years of Union Pacific". Union Pacific. April 11, 2022. Archived from the original on April 11, 2022. Retrieved April 11, 2022.
  65. ^ "Union Pacific Postpones Big Boy No. 4014 West Coast Steam Tour". Union Pacific. April 22, 2022. Archived from the original on April 23, 2022. Retrieved April 23, 2022.
  66. ^ Franz, Justin (June 30, 2022). "Union Pacific 'Big Boy' to Visit Denver in July". Railfan & Railroad. White River Productions. Archived from the original on July 1, 2022. Retrieved July 1, 2022.
  67. ^ "Union Pacific Announces Big Boy No. 4014 July Trip between Denver and Cheyenne". Union Pacific. July 21, 2022. Archived from the original on July 21, 2022. Retrieved July 29, 2022.
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