🌐EnglishEnglishDeutschEspañolFrançaisItalianoPolskiРусскийไทย中文EntityQ15700457· pop 10· linked from 38 articlesUnion Pacific ChallengerAlso known as Union Pacific 4664, Union Pacific 4-6-6-4, Union Pacific 3900five classes of American simple articulated 4-6-6-4 locomotivesWikidata factsImageUp3977.JPGSources (1)de.wikipedia.orgvia Wikidata · CC0On the map2 mapped locationsAvailable in 9 languagesEspañolDeutschРусскийItalianoBelarusianHungarianPolskiไทยvia Wikidata sitelinks · CC0ConnectionsUnion Pacific FEF seriesEntityWorld War IIConceptCategoriesALCO locomotivesLocomotive designs used by multiple railwaysRailway locomotives introduced in 1936Simple articulated locomotivesStandard-gauge locomotives of the United StatesSteam locomotives of the United StatesUnion Pacific Railroad locomotives