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Union Pacific No. 3900 was a fetter 4-6-6-4 "Challenger" type steam locomotive owned by the Union Pacific Railroad.

Union Pacific’s drawings

List of Union Pacific Challenger Locomotives
CSA-1: 3900 (3800)3901 (3801)3902 (3802)3903 (3803)3904 (3804)38053906 (3806)380738083909 (3809)3910 (3810)3911 (3811)3912 (3812)3913 (3813)3914 (3814)
CSA-2: 3815381638173918 (3818)38193820382138223823382238233824382538263827382838293830383138323833383438353836383738383839
4664-3: 39503951395239533954395539563957395839593960396139623963396439653966396739683969
4664-4: 3975397639773978397939803981398239833984398539863987398839893990399139923993399439953996399739983999
4664-5: 37303731373237333734373537363737373839393740374137423743374437453746374737483749
Clinchfield Railroad: Locomotive Type
Extinct: Fetter Challengers
Excursion Star: 39673985
Preserved: 39773985
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