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- 4-8-8-4 abstract "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+042Turkish classification: 46+46Swiss classification: 4/6+4/6The 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.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.".
- 4-8-8-4 thumbnail UP_BigBoy_4023_DSCN0257.JPG?width=300.
- 4-8-8-4 wikiPageExternalLink bigboy.
- 4-8-8-4 wikiPageExternalLink bigboy.htm.
- 4-8-8-4 wikiPageID "420905".
- 4-8-8-4 wikiPageLength "2454".
- 4-8-8-4 wikiPageOutDegree "22".
- 4-8-8-4 wikiPageRevisionID "670567584".
- 4-8-8-4 wikiPageWikiLink 4-6-6-4.
- 4-8-8-4 wikiPageWikiLink Category:4-8-8-4_locomotives.
- 4-8-8-4 wikiPageWikiLink Category:Locomotives_by_wheel_arrangement.
- 4-8-8-4 wikiPageWikiLink Driving_wheel.
- 4-8-8-4 wikiPageWikiLink French_locomotive_classification.
- 4-8-8-4 wikiPageWikiLink Leading_wheel.
- 4-8-8-4 wikiPageWikiLink Steam_locomotive.
- 4-8-8-4 wikiPageWikiLink Swiss_locomotive_and_railcar_classification.
- 4-8-8-4 wikiPageWikiLink Trailing_wheel.
- 4-8-8-4 wikiPageWikiLink Turkish_locomotive_classification.
- 4-8-8-4 wikiPageWikiLink UIC_classification_of_locomotive_axle_arrangements.
- 4-8-8-4 wikiPageWikiLink Union_Pacific_4014.
- 4-8-8-4 wikiPageWikiLink Union_Pacific_Big_Boy.
- 4-8-8-4 wikiPageWikiLink Union_Pacific_Railroad.
- 4-8-8-4 wikiPageWikiLink United_States.
- 4-8-8-4 wikiPageWikiLink Western_Pacific_Railroad.
- 4-8-8-4 wikiPageWikiLink Wheel_arrangement.
- 4-8-8-4 wikiPageWikiLink Whyte_notation.
- 4-8-8-4 wikiPageWikiLink File:UP_BigBoy_4023_DSCN0257.JPG.
- 4-8-8-4 wikiPageWikiLinkText "4-8-8-4".
- 4-8-8-4 wikiPageUsesTemplate Template:Reflist.
- 4-8-8-4 wikiPageUsesTemplate Template:Steam-loco-stub.
- 4-8-8-4 wikiPageUsesTemplate Template:Whyte_types.
- 4-8-8-4 subject Category:4-8-8-4_locomotives.
- 4-8-8-4 subject Category:Locomotives_by_wheel_arrangement.
- 4-8-8-4 hypernym Locomotive.
- 4-8-8-4 type Locomotive.
- 4-8-8-4 type Locomotive.
- 4-8-8-4 type Concept.
- 4-8-8-4 comment "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.".
- 4-8-8-4 label "4-8-8-4".
- 4-8-8-4 sameAs Q4637095.
- 4-8-8-4 sameAs 4-8-8-4.
- 4-8-8-4 sameAs m.026frp.
- 4-8-8-4 sameAs Q4637095.
- 4-8-8-4 wasDerivedFrom 4-8-8-4?oldid=670567584.
- 4-8-8-4 depiction UP_BigBoy_4023_DSCN0257.JPG.
- 4-8-8-4 isPrimaryTopicOf 4-8-8-4.