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1
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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2
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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3
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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4
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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5
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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6
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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7
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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8
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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9
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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10
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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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 4-8-8-4 "Big Boy"
HO Scale 4-8-8-4 "Big Boy"
::2008/07/31::
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13
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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14
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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15
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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16
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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17
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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18
HO UP 4-8-8-4 Big Boy  Broadway Limited
HO UP 4-8-8-4 Big Boy Broadway Limited
::2012/10/06::
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19
1941 Union Pacific Big Boy Locomotive #4006
1941 Union Pacific Big Boy Locomotive #4006
::2011/08/27::
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20
UNION PACIFIC 4-8-8-4 Big Boy 4014
UNION PACIFIC 4-8-8-4 Big Boy 4014
::2013/08/31::
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21
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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22
Western Steam Power "Big Boy
Western Steam Power "Big Boy's in Action"
::2011/01/12::
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23
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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24
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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25
K-Line Big Boy 4-8-8-4
K-Line Big Boy 4-8-8-4
::2011/12/31::
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26
4-8-8-4 Big Boy
4-8-8-4 Big Boy
::2014/04/20::
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27
UNION PACIFIC 4-8-8-4 BIGBOY 4024
UNION PACIFIC 4-8-8-4 BIGBOY 4024
::2012/08/14::
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28
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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29
Big Boy 4-8-8-4 N-scale
Big Boy 4-8-8-4 N-scale
::2008/04/27::
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30
tenshodo big boy 4-8-8-4 up
tenshodo big boy 4-8-8-4 up
::2013/05/29::
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31
lego 4-8-8-4 big boy 2
lego 4-8-8-4 big boy 2
::2011/12/10::
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32
ATHEARN GENESIS HO BIG BOY 4-8-8-4 SMOKING
ATHEARN GENESIS HO BIG BOY 4-8-8-4 SMOKING
::2010/03/26::
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33
lego 4-8-8-4 big boy 1
lego 4-8-8-4 big boy 1
::2011/12/10::
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34
UNION PACIFIC 4-8-8-4 BIGBOY 4012
UNION PACIFIC 4-8-8-4 BIGBOY 4012
::2012/03/02::
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35
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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36
HO Scale Union Pacific 4-8-8-4 Big Boy
HO Scale Union Pacific 4-8-8-4 Big Boy
::2009/05/19::
Play Video
37
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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38
HO Rivarossi DCC/Sound Big Boy 4-8-8-4 UP 4005
HO Rivarossi DCC/Sound Big Boy 4-8-8-4 UP 4005
::2012/03/03::
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39
NYC 4-8-4 Niagara 6024
NYC 4-8-4 Niagara 6024
::2013/10/27::
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40
ATHEARN  GENESIS BIG BOY 4-8-8-4
ATHEARN GENESIS BIG BOY 4-8-8-4
::2011/03/14::
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41
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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42
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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43
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
::2014/01/28::
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44
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::
Play Video
45
Athearn GENESIS Big Boy 4-8-8-4
Athearn GENESIS Big Boy 4-8-8-4
::2010/09/06::
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46
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.
::2010/03/19::
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47
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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48
Atheran 4-8-8-4 Bigboy N-scale
Atheran 4-8-8-4 Bigboy N-scale
::2008/03/10::
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49
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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50
lego treno big boy  4-8-8-4 in movimento
lego treno big boy 4-8-8-4 in movimento
::2014/02/01::
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RESULTS [51 .. 101]
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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