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Western Steam Power "Big Boy
Western Steam Power "Big Boy's in Action"
Published: 2011/01/12
Channel: Conrail6370
UNION PACIFIC RAILROAD BIG BOY STEAM LOCOMOTIVE FILM  71522
UNION PACIFIC RAILROAD BIG BOY STEAM LOCOMOTIVE FILM 71522
Published: 2015/04/07
Channel: PeriscopeFilm
UNION PACIFIC 4000 CLASS STEAM LOCOMOTIVES  "BIG BOY AND HIS BROTHERS"  FILM 51254
UNION PACIFIC 4000 CLASS STEAM LOCOMOTIVES "BIG BOY AND HIS BROTHERS" FILM 51254
Published: 2017/01/31
Channel: PeriscopeFilm
Union Pacific Big Boy Collection
Union Pacific Big Boy Collection
Published: 2007/06/21
Channel: pentrexvideos
Union Pacific 4-8-8-4 Big Boy steam locomotive #4014 move South Fontana 1/26/14
Union Pacific 4-8-8-4 Big Boy steam locomotive #4014 move South Fontana 1/26/14
Published: 2014/01/28
Channel: Railfan1000
RIDE ON THE PLOWMANS MINIATURE GARDEN RAILWAY WITH UNION PACIFIC 4-8-8-4
RIDE ON THE PLOWMANS MINIATURE GARDEN RAILWAY WITH UNION PACIFIC 4-8-8-4 'BIG BOY' No. 4008
Published: 2016/04/12
Channel: Classic Traction
Ruby Gem Olympia Big Boy 4-8-8-4 Union Pacific Rare Brass Model Locomotive
Ruby Gem Olympia Big Boy 4-8-8-4 Union Pacific Rare Brass Model Locomotive
Published: 2017/01/01
Channel: Kevin C
Union Pacific 4001 Big Boy 4-8-8-4 Rivarossi HO Steam Locomotive
Union Pacific 4001 Big Boy 4-8-8-4 Rivarossi HO Steam Locomotive
Published: 2017/07/24
Channel: Wolfman's Productions
ebay unboxing ho brass trains haul big boy 4-8-8-4
ebay unboxing ho brass trains haul big boy 4-8-8-4
Published: 2016/07/31
Channel: Kevin C
Kline 4015 4-8-8-4 bigboy steam engine with Lionel aluminum Union Pacific passenger cars
Kline 4015 4-8-8-4 bigboy steam engine with Lionel aluminum Union Pacific passenger cars
Published: 2017/01/21
Channel: Mikes trains O gauge
Lego big boy 4-8-8-4  2013
Lego big boy 4-8-8-4 2013
Published: 2013/10/16
Channel: graziano martini
Union Pacific 4-8-8-4 Big Boy with Tsunami sound
Union Pacific 4-8-8-4 Big Boy with Tsunami sound
Published: 2012/10/09
Channel: 15RSD
Union Pacific Giant  4-8-8-4 Big Boy 4014 at Grand Ave Bridge Diamond Bar. 1/26/14
Union Pacific Giant 4-8-8-4 Big Boy 4014 at Grand Ave Bridge Diamond Bar. 1/26/14
Published: 2014/01/28
Channel: Railfan1000
Tenshodo Big Boy 4-8-8-4 Union Pacific 4000 Runs Well Brass HO Japan PFM UP H.O.
Tenshodo Big Boy 4-8-8-4 Union Pacific 4000 Runs Well Brass HO Japan PFM UP H.O.
Published: 2013/07/26
Channel: Kevin C
lego treno big boy 4-8-8-4
lego treno big boy 4-8-8-4
Published: 2014/02/01
Channel: graziano martini
Modeling a train: 4000-class 4-8-8-4  Blender timelapse part 1
Modeling a train: 4000-class 4-8-8-4 Blender timelapse part 1
Published: 2017/07/23
Channel: Nashman222
Athearn Nscal 4-8-8-4 BIGBOY DC control test
Athearn Nscal 4-8-8-4 BIGBOY DC control test
Published: 2015/05/16
Channel: skyline2000gta
HO dcc TRIX Union Pacific Big Boy 4015 4-8-8-4 with ESU sound with string of TRIX cars.
HO dcc TRIX Union Pacific Big Boy 4015 4-8-8-4 with ESU sound with string of TRIX cars.
Published: 2010/03/19
Channel: Bastiaan Blinksma
Athearn GENESIS Big Boy 4-8-8-4
Athearn GENESIS Big Boy 4-8-8-4
Published: 2010/09/06
Channel: ETRAINMOVIE
Brass HO Tenshodo Big Boy 4-8-8-4 Union Pacific 4000 Ebay Sale ~
Brass HO Tenshodo Big Boy 4-8-8-4 Union Pacific 4000 Ebay Sale ~
Published: 2013/03/29
Channel: Kevin C
Visiting Kenefick Park in Omaha Nebraska ft. UP 4023 (4-8-8-4 Steam Loco) and UP 6900 (DDA40X)
Visiting Kenefick Park in Omaha Nebraska ft. UP 4023 (4-8-8-4 Steam Loco) and UP 6900 (DDA40X)
Published: 2013/07/30
Channel: crail4ever
Union Pacific 4006 Big Boy 4-8-8-4 HO Scale - Amherst Railway Society 2014 Railroad Hobby Show
Union Pacific 4006 Big Boy 4-8-8-4 HO Scale - Amherst Railway Society 2014 Railroad Hobby Show
Published: 2014/01/28
Channel: novelyo
Big Boy Banter! | TS2016 | Union Pacific 4 8 8 4 Big Boy | Sherman Hill
Big Boy Banter! | TS2016 | Union Pacific 4 8 8 4 Big Boy | Sherman Hill
Published: 2017/07/12
Channel: Blanca Norton
057829-Gauge 1 Brass Model Train - FAM Fine Art Models UP Union Pacific 4-8-8-4 Big Boy #4000 w/ Dis
057829-Gauge 1 Brass Model Train - FAM Fine Art Models UP Union Pacific 4-8-8-4 Big Boy #4000 w/ Dis
Published: 2014/08/14
Channel: BRASSTRAINSvideo
HO MTH 4 8 8 4 BIG BOY UP#4005 ♪DCS SOUND♪B
HO MTH 4 8 8 4 BIG BOY UP#4005 ♪DCS SOUND♪B
Published: 2016/01/25
Channel: kishamodels
花月園 4-8-8-4 BIGBOY HO train UP HW passenger car
花月園 4-8-8-4 BIGBOY HO train UP HW passenger car
Published: 2010/01/31
Channel: DMC12DELOREAN
Athearn 4-8-8-4 Big_Boy音效
Athearn 4-8-8-4 Big_Boy音效
Published: 2013/04/22
Channel: Yiman Chang
paragon cab-forward 4-8-8-2
paragon cab-forward 4-8-8-2
Published: 2011/04/15
Channel: soptrain
UP 4-8-8-4 Ebay Test Run 2015-10-17
UP 4-8-8-4 Ebay Test Run 2015-10-17
Published: 2015/10/17
Channel: Steve Huminski
BLI 4-8-4 Santa Fe 3762 SMOKE GENERATOR REPAIR
BLI 4-8-4 Santa Fe 3762 SMOKE GENERATOR REPAIR
Published: 2014/01/07
Channel: gtboylin
Union Pacific 4 8 8 4 UP4016 F4 PFA sound
Union Pacific 4 8 8 4 UP4016 F4 PFA sound
Published: 2014/06/16
Channel: kishamodels
Union Pacific 4 8 8 4 UP4005 ♪DCS SOUND♪
Union Pacific 4 8 8 4 UP4005 ♪DCS SOUND♪
Published: 2014/06/16
Channel: kishamodels
Union Pacific Big Boy 4014 moves to West Colton 1-26-14
Union Pacific Big Boy 4014 moves to West Colton 1-26-14
Published: 2014/01/28
Channel: theUP844
055043-HO Brass Model Train - Hallmark 4-8-8-4 Centipede DR-12-8-1500 Diesel Engine - Late Run
055043-HO Brass Model Train - Hallmark 4-8-8-4 Centipede DR-12-8-1500 Diesel Engine - Late Run
Published: 2015/07/21
Channel: BRASSTRAINSvideo
UP Big Boy 4014 Leaves Pomona, CA Part Four
UP Big Boy 4014 Leaves Pomona, CA Part Four
Published: 2014/01/27
Channel: altosax18
UNION PACIFIC Big Boy 4014
UNION PACIFIC Big Boy 4014
Published: 2014/11/21
Channel: jacksOtrains
The Story of Norfolk and Western 1218
The Story of Norfolk and Western 1218
Published: 2016/08/25
Channel: 844Steamtrain
Union Pacific 4 8 8 4 UP4018 ♪DCS SOUND♪
Union Pacific 4 8 8 4 UP4018 ♪DCS SOUND♪
Published: 2014/06/16
Channel: kishamodels
Rivarossi Big Boy #4018 ESU Loksound Review
Rivarossi Big Boy #4018 ESU Loksound Review
Published: 2017/03/09
Channel: historyfan95
MTH Premier SP Cab Forward (4-8-8-2) (PS1) O-Gauge Steam Locomotive in True HD 1080p
MTH Premier SP Cab Forward (4-8-8-2) (PS1) O-Gauge Steam Locomotive in True HD 1080p
Published: 2010/11/29
Channel: toytrains1
Train Simulator 2013 Big Boy v2.0
Train Simulator 2013 Big Boy v2.0
Published: 2012/11/26
Channel: Rbsanford
MTH Premier DM&IR Yellowstone (2-8-8-4) O-Gauge Steam Locomotive in True HD 1080p
MTH Premier DM&IR Yellowstone (2-8-8-4) O-Gauge Steam Locomotive in True HD 1080p
Published: 2010/06/06
Channel: toytrains1
Union Pacific Big Boy 4014 on the road to restoration: West Colton to Barstow 4-28-14
Union Pacific Big Boy 4014 on the road to restoration: West Colton to Barstow 4-28-14
Published: 2014/05/01
Channel: theUP844
اهداء من اخت العريس شعرواغنيه   5 5 4 8 9 9 5 5 05
اهداء من اخت العريس شعرواغنيه 5 5 4 8 9 9 5 5 05
Published: 2012/10/02
Channel: afra7lena
محمد عبده زفة حجازيه الصلاة على الممجد 5 5 4 8 9 9 5 5 05
محمد عبده زفة حجازيه الصلاة على الممجد 5 5 4 8 9 9 5 5 05
Published: 2012/11/27
Channel: afra7lena
Review of the Athearn HO Scale Big Boy #4014 Steam Locomotive
Review of the Athearn HO Scale Big Boy #4014 Steam Locomotive
Published: 2013/09/21
Channel: jlwii2000
Train Driver Journey 4 - Introduction to Steam
Train Driver Journey 4 - Introduction to Steam
Published: 2015/10/08
Channel: N3V Games
UP Big Boy Rivarossi on Test Track 2nd radius curves
UP Big Boy Rivarossi on Test Track 2nd radius curves
Published: 2015/03/20
Channel: Calvertfilm
Guided Breathing Mantra (4-8-8) Pranayama Yoga Breathing Exercise Level 3 Vol 23
Guided Breathing Mantra (4-8-8) Pranayama Yoga Breathing Exercise Level 3 Vol 23
Published: 2015/10/04
Channel: Breathing Mantra
MTH HO Challenger Steam Locomotive
MTH HO Challenger Steam Locomotive
Published: 2012/10/26
Channel: MTHElectricTrains
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WIKIPEDIA ARTICLE

From Wikipedia, the free encyclopedia
Jump to: navigation, search
A Big Boy locomotive. This example is Union Pacific 4023.

In the Whyte notation for the classification of steam locomotives by wheel arrangement, a 4-8-8-4 is a locomotive with a four-wheel leading truck, two sets of eight driving wheels, and a four-wheel trailing truck. 4-8-8-4s are commonly known as "Big Boys".

Other equivalent classifications are:
UIC classification: 2DD2 (also known as German classification and Italian classification)
French classification: 240+042
Turkish classification: 46+46
Swiss classification: 4/6+4/6

The equivalent UIC classification is refined to (2′D)D2′ for Mallet locomotives.

4-8-8-4 Big Boys were only produced for the Union Pacific Railroad. Twenty-five such engines were built between 1941 and 1944, numbered 4000 to 4024. Eight of these locomotives survive, all on static public display at various sites in the United States. Union Pacific has announced plans to restore No. 4014 to operation for use in mainline excursion service. No. 4014 is expected to be operational by 2019.[1]

The UP Big Boys were an expansion of the 4-6-6-4 "Challenger" type articulated locomotive. Although their wheels were an inch (25 mm) smaller than those of the Challengers, they were still able to sustain high speeds. Adding four driving wheels increased the pulling power of the locomotive and reduced the need for helper locomotives over steep grades.

Other American railroads considered buying 4-8-8-4s, including the Western Pacific Railroad, which already rostered large 2-8-8-2s and 4-6-6-4s, but diesel locomotives were gaining popularity and soon were able to displace these monster locomotives.

External links[edit]

References[edit]

  1. ^ Trains Magazine. "Union Pacific Big Boy: Rebirth of a Legend". Retrieved 22 October 2013. 


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