This article discusses the roster of locomotives that are possible, given my time frame, as well as which locomotives were purchased by Union Pacific prior to 1960. This information is much easier to get online than that for rolling stock, both passenger and freight.

Steam Locomotives

NameBuild
Dates
Number
Built
Numbers
FEF-31937-194445 in three
classes
800-844
4-8-8-4,
Big Boy
1941-194425 in two
classes
4000-4024
Challenger1936-1944105 in five
classes
1960 Numbers
3800-3814
3815-3839
3944; 3950-3969 (bar 3968)
3708-3717
3930-3949; 3930, 3031, 3032, 3034,
3738, 3043, 3044
renumbered 3700-3707

Diesel Locomotives

EMD GP-7.

EMD F-7.

EMD SD-7.

ALCO RS-2.

ALCO RS-3.

EMD GP-9.

EMD E-9.

EMD SD-24.

GE U25B.

EMD GP20.

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