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Union Pacific Railroad No. 4001 was a four-cylinder articulated 4-8-8-4 "Big Boy" type steam locomotive built by the American Locomotive Company in August 1941 for the Union Pacific Railroad.

The locomotive was scrapped in November 1961.

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