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4015

Union Pacific No. 4015 was a four-cylinder articulated 4-8-8-4 Big Boy-type steam locomotive owned by the Union Pacific Railroad. This locomotive was built by Alco in 1941 along with the other Big Boy locomotives to address the problems concerning the preceding 4-6-6-4 Challenger class locomotives.

It was built for freight service on the Union Pacific railroad and ran in service until July 1959, when it was retired along with the other Big Boy Locomotives. It was sold for scrap shortly after.

List of Union Pacific Big Boy Locomotives
Real-Life Members: 4000400140024003400440054006400740084009401040114012401340144015401640174018401940204021402240234024
Fallen: 400040014002400340074008400940104011401340134015401640194020402140224024
Preserved: 40044005400640124014401740184023
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