Union Pacific No. 4017

Union Pacific 4017, or UP 4017, is a four-cylinder articulated 4-8-8-4 "Big Boy"-type steam locomotive owned by Union Pacific Railroad. It was built by ALCO in 1941 along with the other Big Boy locomotives to rectify issues with the preceding 4-6-6-4 "Challenger" class locomotives.
It ran in service hauling freight trains until July 21, 1959, when it was retired along with the other "Big Boy" locomotives.
It is now a static display at the National Railroad Museum in Green Bay, Wisconsin.
==Trivia==
*No. 4017 is one of eight surviving Big Boys.
*This locomotive was one of the last Big Boys to undergo heavy repairs at Union Pacific's Cheyenne, WY, workshops in July 1959.
==Gallery==
File:EC86C525-E982-4C8D-B919-969FAEAA48FD.jpeg
File:Flyingscotsmanandbigboy.jpg|Big Boy No. 4017 with Flying Scotsman
File:4017withspider.jpg
File:Bigboyatchristmas.jpg
File:UP4017numberplate.jpg
==Specs==
* ALCo.BigBoy Dimensions
* ALCo.BigBoy Tech Info
* ALCo.BigBoy Tech Info
* ALCo.BigBoy Tech Info
* ALCo.BigBoy Tech Info
* ALCo.BigBoy Tech Info
* ALCo.BigBoy Tech Info
* ALCo.BigBoy Tech Info
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Category:Steam locomotives
Category:ALCO locomotives
Category:Union Pacific locomotives
Category:American locomotives
Category:Articulated locomotives
Category:4-8-8-4 locomotives
Category:4-8-8-4 steam locomotives
Category:Eight-coupled locomotives
Category:Built in 1941
Category:Freight locomotives
Category:Locomotives
Category:Preserved locomotives
Category:Union Pacific Big Boy
Category:American steam locomotives
Category:Preserved steam locomotives
Category:Tender locomotives
Category:Standard gauge locomotives of the United States
Category:National Railroad Museum
Category:Preserved steam locomotives