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.
| 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.
Read more about this topic: Union Pacific Challenger
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