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Brass HO Locomotive Tetsudo HandMade Big Boy Rare Union Pacific 4-8-8-4 UP Japan
Brass HO Locomotive Tetsudo HandMade Big Boy Rare Union Pacific 4-8-8-4 UP Japan
Published: 2016/07/21
Channel: Kevin C
G Scale Rio Grande 4-8-8-4/Barry
G Scale Rio Grande 4-8-8-4/Barry's Big Trains 2-8-0 D&RGW
Published: 2017/06/27
Channel: Imagination Station Kids On Track
Athearn GENESIS Big Boy 4-8-8-4
Athearn GENESIS Big Boy 4-8-8-4
Published: 2010/09/06
Channel: ETRAINMOVIE
Broadway sound in analogue 4 8 8 4
Broadway sound in analogue 4 8 8 4
Published: 2016/07/19
Channel: Paul Bennett
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
Big Boy
Big Boy
Published: 2006/09/16
Channel: ChronoStorm
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
MTH PREMIER 4-8-8-4 BIG BOY w/DYNAMO/WHISTLE SMOKE UPGRADE!!!
MTH PREMIER 4-8-8-4 BIG BOY w/DYNAMO/WHISTLE SMOKE UPGRADE!!!
Published: 2013/05/06
Channel: jdsltd
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
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
UP Big Boy 4014 Leaves Pomona, CA Part Four
UP Big Boy 4014 Leaves Pomona, CA Part Four
Published: 2014/01/27
Channel: altosax18
L&NE 2-10-0 OVERLAND BIG BOY 4-8-8-4 GEM OLYMPIA RUBY 2-8-0 UP ~
L&NE 2-10-0 OVERLAND BIG BOY 4-8-8-4 GEM OLYMPIA RUBY 2-8-0 UP ~
Published: 2013/05/17
Channel: Kevin C
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 افراح لينا
4-8-8-4 Big Boy Locomotive 蒸汽火車頭
4-8-8-4 Big Boy Locomotive 蒸汽火車頭
Published: 2017/08/18
Channel: BotFeeder Filament
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 Rivarossi on Test Track 2nd radius curves
UP Big Boy Rivarossi on Test Track 2nd radius curves
Published: 2015/03/20
Channel: Calvertfilm
4884-TT-01 DSC_0251.MOV
4884-TT-01 DSC_0251.MOV
Published: 2011/11/28
Channel: 03patines
Big Boy 4-8-8-4 - UP4014
Big Boy 4-8-8-4 - UP4014
Published: 2017/11/02
Channel: Prashant Sasidharan
Kato Heavy Mikado N scale 2-8-2 steam engine with sound
Kato Heavy Mikado N scale 2-8-2 steam engine with sound
Published: 2014/12/20
Channel: BUBULEPOISSON
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WIKIPEDIA ARTICLE

From Wikipedia, the free encyclopedia
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A Big Boy locomotive. This example is Union Pacific 4023.

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

Other equivalent classifications are:

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 Big Boy 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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