Union Pacific Challenger - Construction

Construction

The 105 were divided into five orders, which can be put into two groups: the first two orders of "light" Challengers, and the final three of "heavy" Challengers.

Table of orders and numbers
Class Quantity Manufacturer Serial Nos. Year UP No. Notes
CSA-1 15 American Locomotive Company 68745–68759 1936 3900–3914 Converted to oil fuel in 1941–43; renumbered 3800–3814 in 1944
CSA-2 25 American Locomotive Company 68924–68948 1937 3915–3939 Converted to oil fuel; renumbered 3815–3839 in 1944
4664-3 20 American Locomotive Company 69760–69779 1942 3950–3969
4664-4 25 American Locomotive Company 70158–70162
70169–70182
70678–70683		 1943 3975–3999 3975–3984 converted to oil fuel in 1945; renumbered 3708–3717 in 1952
4664-5 20 American Locomotive Company 72792–72811 1944 3930–3949 3930/31/32/34/37/38/43/44 converted to oil fuel in 1952 and renumbered 3700–3707.

Two examples survive today: Union Pacific 3985, used for excursion services by Union Pacific and Union Pacific 3977, on static display in North Platte, NE.

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