Play Video
1
Union Pacific 4-8-8-4 "Big Boy" Steam Engine Footage
Union Pacific 4-8-8-4 "Big Boy" Steam Engine Footage
::2011/01/16::
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2
Union Pacific Big Boy 4005 (4-8-8-4)
Union Pacific Big Boy 4005 (4-8-8-4)
::2011/09/17::
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3
Broad Way Limited BLI Big Boy Union Pacific 4-8-8-4 Part 2
Broad Way Limited BLI Big Boy Union Pacific 4-8-8-4 Part 2
::2012/06/04::
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4
Western Steam Power "Big Boy
Western Steam Power "Big Boy's in Action"
::2011/01/12::
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5
2013 Athearn N Scale Big Boy 4-8-8-4 Review
2013 Athearn N Scale Big Boy 4-8-8-4 Review
::2013/04/19::
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6
Athearn N Scale Big Boy 4-8-8-4
Athearn N Scale Big Boy 4-8-8-4
::2013/04/24::
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7
LEGO TRAIN BIG BOY 4-8-8-4 INSTRUCTIONS
LEGO TRAIN BIG BOY 4-8-8-4 INSTRUCTIONS
::2013/08/24::
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8
MTH Union Pacific Big Boy 4-8-8-4 #4016
MTH Union Pacific Big Boy 4-8-8-4 #4016
::2013/09/21::
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9
BLI Broadway Limited Union Pacific Big Boy 4-8-8-4
BLI Broadway Limited Union Pacific Big Boy 4-8-8-4
::2011/01/10::
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10
Precision Craft Models 4-8-8-4 Union Pacific Big Boy#4002 Steam Locomotive HO Scale
Precision Craft Models 4-8-8-4 Union Pacific Big Boy#4002 Steam Locomotive HO Scale
::2012/11/29::
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11
MTH Premier UP Big Boy (4-8-8-4) O-Gauge Steam Locomotive
MTH Premier UP Big Boy (4-8-8-4) O-Gauge Steam Locomotive
::2007/03/21::
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12
HO Scale Athearn Genesis 4-8-8-4 Union Pacific Big Boy
HO Scale Athearn Genesis 4-8-8-4 Union Pacific Big Boy
::2012/06/16::
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13
HO Scale 4-8-8-4 "Big Boy"
HO Scale 4-8-8-4 "Big Boy"
::2008/07/31::
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14
K-Line Big Boy 4-8-8-4
K-Line Big Boy 4-8-8-4
::2011/12/31::
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15
Restoring the Union Pacific
Restoring the Union Pacific's Big Boy 4-8-8-4 Locomotive No. 4014
::2014/05/01::
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16
HO ATH 4 8 8 4 Big Boy UP4019 ♪DCC SOUND♪
HO ATH 4 8 8 4 Big Boy UP4019 ♪DCC SOUND♪
::2013/08/01::
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17
MY MTH   BIG BOY 4-8-8-4
MY MTH BIG BOY 4-8-8-4
::2014/01/15::
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18
ACCUCRAFT  UP 4-8-8-4 BIG BOY, LIVE STEAM
ACCUCRAFT UP 4-8-8-4 BIG BOY, LIVE STEAM
::2012/08/01::
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19
Union Pacific Big Boy 4-8-8-4 in freight service Vol. 1
Union Pacific Big Boy 4-8-8-4 in freight service Vol. 1
::2009/03/24::
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20
MTH HO 4 8 8 4 BIG BOY UP4005 ♪DCS SOUND♪
MTH HO 4 8 8 4 BIG BOY UP4005 ♪DCS SOUND♪
::2013/10/20::
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21
Big Boy 4-8-8-4 N-scale
Big Boy 4-8-8-4 N-scale
::2008/04/27::
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22
4-8-8-4 UP Big Boy with Circus Train - Monroe Train Show
4-8-8-4 UP Big Boy with Circus Train - Monroe Train Show
::2013/02/10::
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23
1941 Union Pacific Big Boy Locomotive #4006
1941 Union Pacific Big Boy Locomotive #4006
::2011/08/27::
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24
UNION  PACIFIC  BIGBOY 4-8-8-4 (#4014)  ATHEARN  N-SCALE 走行動画
UNION PACIFIC BIGBOY 4-8-8-4 (#4014) ATHEARN N-SCALE 走行動画
::2013/07/15::
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25
O Gauge Union Pacific Big Boy 4-8-8-4 Joshua Lionel Cowen JLC vs differences Lionmaster
O Gauge Union Pacific Big Boy 4-8-8-4 Joshua Lionel Cowen JLC vs differences Lionmaster
::2013/01/13::
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26
BLI Blue Line Custom 4-8-8-4 Big Boy
BLI Blue Line Custom 4-8-8-4 Big Boy
::2010/01/16::
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27
Lego big boy 4-8-8-4  2013
Lego big boy 4-8-8-4 2013
::2013/10/16::
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28
UP Doubleheader 4 8 8 4 BIG BOY Union Pacific
UP Doubleheader 4 8 8 4 BIG BOY Union Pacific
::2013/10/20::
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29
Union Pacific "Big Boy" 4-8-8-4 Steam Locomotive - N scale by Athearn
Union Pacific "Big Boy" 4-8-8-4 Steam Locomotive - N scale by Athearn
::2013/01/27::
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30
UP 4015 4-8-8-4 Big Boy (Trix, ESU) Test
UP 4015 4-8-8-4 Big Boy (Trix, ESU) Test
::2009/05/23::
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31
Bachmann EM-1 2-8-8-4 Yellowstone with SoundTraxx Tsunami
Bachmann EM-1 2-8-8-4 Yellowstone with SoundTraxx Tsunami
::2012/11/19::
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32
Running of Lionel
Running of Lionel's J.L.C Union Pacific 4-8-8-4 Big Boy #4024 with Legacy
::2010/09/12::
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33
Blissfield Model Railroad Steamer 4-8-8-4
Blissfield Model Railroad Steamer 4-8-8-4
::2013/02/19::
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34
Big Boy
Big Boy's 1st Steam Trial - LIVE STEAM
::2012/11/06::
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35
Union Pacific Big Boy 4-8-8-4, Athearn N scale
Union Pacific Big Boy 4-8-8-4, Athearn N scale
::2012/04/24::
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36
Athearn 4-8-8-4 BigBoy UP
Athearn 4-8-8-4 BigBoy UP
::2008/03/03::
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37
Train Simulator 2013 Big Boy 4-8-8-4
Train Simulator 2013 Big Boy 4-8-8-4
::2012/10/19::
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38
Athearn Union Pacific 4-8-8-4 BigBoy
Athearn Union Pacific 4-8-8-4 BigBoy
::2012/05/13::
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39
Atheran 4-8-8-4 Bigboy N-scale
Atheran 4-8-8-4 Bigboy N-scale
::2008/03/10::
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40
MTH Imperial Northern Reading 4-8-4
MTH Imperial Northern Reading 4-8-4
::2013/03/05::
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41
Rivarossi 4-8-8-4 Big Boy 4011 "Digital" Without Decoder Arnold
Rivarossi 4-8-8-4 Big Boy 4011 "Digital" Without Decoder Arnold
::2010/12/21::
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42
HO dcc TRIX Union Pacific Big Boy 4015 4-8-8-4 with ESU loksound 3, and a string of TRIX cars
HO dcc TRIX Union Pacific Big Boy 4015 4-8-8-4 with ESU loksound 3, and a string of TRIX cars
::2010/03/21::
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43
Lionel 6-28029 Union Pacific BIG BOY 4-8-8-4 TMCC
Lionel 6-28029 Union Pacific BIG BOY 4-8-8-4 TMCC
::2011/01/01::
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44
Athearn N Scale Union Pacific 4-8-8-4 Big Boy
Athearn N Scale Union Pacific 4-8-8-4 Big Boy
::2008/07/06::
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45
MTH RailKing 4-8-8-4 Big Boy with ProtoSound
MTH RailKing 4-8-8-4 Big Boy with ProtoSound
::2011/02/06::
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46
N Scale Bachmann Spectrum 2-8-8-4 EM-1 B&O Yellowstone
N Scale Bachmann Spectrum 2-8-8-4 EM-1 B&O Yellowstone
::2013/12/31::
Play Video
47
MTH Premier UP Big Boys (4-8-8-4) O-Gauge Steam Locomotives
MTH Premier UP Big Boys (4-8-8-4) O-Gauge Steam Locomotives
::2007/03/17::
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48
MTH 2-8-8-4 DMIR Yellowstone Set
MTH 2-8-8-4 DMIR Yellowstone Set
::2010/09/01::
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49
NEW MTH HO UNION PACIFIC 4-8-8-4 BIG BOY
NEW MTH HO UNION PACIFIC 4-8-8-4 BIG BOY
::2010/09/07::
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50
Athearn Genesis "Big Boy" 4-8-8-4
Athearn Genesis "Big Boy" 4-8-8-4
::2010/05/14::
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From Wikipedia, the free encyclopedia
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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 survive, all on static public display at various sites in the USA. 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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