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1
Western Steam Power "Big Boy
Western Steam Power "Big Boy's in Action"
::2011/01/12::
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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
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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4
Lionel Vision Line Union Pacific 4-8-8-4 Big Boy #4014
Lionel Vision Line Union Pacific 4-8-8-4 Big Boy #4014
::2015/01/13::
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5
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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6
HO Scale 4-8-8-4 "Big Boy"
HO Scale 4-8-8-4 "Big Boy"
::2008/07/31::
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7
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
::2013/02/09::
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8
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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9
Lionel Vision Line U.P. 4-8-8-4 Big Boy
Lionel Vision Line U.P. 4-8-8-4 Big Boy
::2014/12/29::
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10
Big Boy 4-8-8-4 N-scale
Big Boy 4-8-8-4 N-scale
::2008/04/27::
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11
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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12
ACCUCRAFT  UP 4-8-8-4 BIG BOY, LIVE STEAM
ACCUCRAFT UP 4-8-8-4 BIG BOY, LIVE STEAM
::2012/07/31::
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13
HO Union Pacific 4-8-8-4 Big Boy 4014 Customized (Excursion Version)
HO Union Pacific 4-8-8-4 Big Boy 4014 Customized (Excursion Version)
::2014/05/23::
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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
::2013/09/20::
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15
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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16
MTH 2-8-8-4 DMIR Yellowstone Set
MTH 2-8-8-4 DMIR Yellowstone Set
::2010/09/01::
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17
Broadway Limited 4-8-4 Northern #3751 ATSF review (2nd run) HO Scale Paragon 2
Broadway Limited 4-8-4 Northern #3751 ATSF review (2nd run) HO Scale Paragon 2
::2013/06/05::
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18
Lionel 6-28029 Union Pacific BIG BOY 4-8-8-4 TMCC
Lionel 6-28029 Union Pacific BIG BOY 4-8-8-4 TMCC
::2010/12/31::
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19
UP 4014 Big Boy Rolling at Pomona, CA
UP 4014 Big Boy Rolling at Pomona, CA
::2013/11/14::
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20
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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21
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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22
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
::2012/06/03::
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23
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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24
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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25
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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26
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
::2013/01/12::
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27
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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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
Lionel Santa Fe 4-8-4 Northern
Lionel Santa Fe 4-8-4 Northern
::2013/06/08::
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30
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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31
1941 Union Pacific Big Boy Locomotive #4006
1941 Union Pacific Big Boy Locomotive #4006
::2011/08/27::
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32
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
::2007/03/16::
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33
Lionel Southern Pacific 4-8-4 GS-2 Daylight
Lionel Southern Pacific 4-8-4 GS-2 Daylight
::2013/12/14::
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34
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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35
K-Line Big Boy 4-8-8-4
K-Line Big Boy 4-8-8-4
::2011/12/31::
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36
lego 4-8-8-4 big boy 1
lego 4-8-8-4 big boy 1
::2011/12/09::
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37
MTH Premier UP Big Boy (4-8-8-4) O-Gauge Steam Locomotive with the Caboose Train in True HD 1080p
MTH Premier UP Big Boy (4-8-8-4) O-Gauge Steam Locomotive with the Caboose Train in True HD 1080p
::2010/11/03::
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38
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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39
BLI Blue Line Custom 4-8-8-4 Big Boy
BLI Blue Line Custom 4-8-8-4 Big Boy
::2010/01/15::
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40
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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41
Lionel Pilot 4-8-4 GS-6
Lionel Pilot 4-8-4 GS-6
::2013/12/19::
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42
Lionel Southern Pacific 4-8-8-2 AC-12 Cab Forward
Lionel Southern Pacific 4-8-8-2 AC-12 Cab Forward
::2014/11/29::
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43
Athearn Genesis "Big Boy" 4-8-8-4
Athearn Genesis "Big Boy" 4-8-8-4
::2010/05/14::
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44
lego 4-8-8-4 big boy 2
lego 4-8-8-4 big boy 2
::2011/12/09::
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45
Lego big boy 4-8-8-4  2013
Lego big boy 4-8-8-4 2013
::2013/10/16::
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46
Rivarossi Bigboy 4-8-8-4 by www.trains4u.in India Mumbai
Rivarossi Bigboy 4-8-8-4 by www.trains4u.in India Mumbai
::2014/09/17::
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47
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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48
3rd Rail
3rd Rail's Southern Pacific 2-8-8-4, Oil Fired AC9 #3810
::2014/12/02::
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49
Union Pacific Big Boy 4-8-8-4 on the Los Angeles Limited Vol. 1
Union Pacific Big Boy 4-8-8-4 on the Los Angeles Limited Vol. 1
::2009/03/24::
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50
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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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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