3/6/2025
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Home
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Union Pacific Railroad Company
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Locomotives
>
EMD SD24
> UP 3999
Pictures of UP 3999
Owner:
Union Pacific Railroad Company
Model:
EMD SD24
Built As:
UP 423 (SD24)
Serial Number:
25381
Order No:
5602
Frame Number:
5602-A24
Built:
9/1959
Notes:
built as 423; later 3100, 3200, 3399, 3999, 99.
Other locos with this serial:
UP 3999(SD24)
UP 3399(SD24)
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Title:
UP's Experimental SD24
Description:
UP 3999 was a one-of-a-kind experiment with the road rebuilding one of its SD24s with a 16-645 prime mover at 3000HP- very simliar to an SD40. Originally delivered as UP 423, it would subsequently be numbered 3100, 3200, 3399, 3999 and finally 99 before being sold for scrap in 11/85. The multiple renumberings were required as waves of EMD SD40s and 40-2s forced a change. It's shown here in consist on a gray January day. For more details see Don Strack's exceptional "Utah Rails" site.
Photo Date:
1/7/1977
Upload Date:
7/20/2013 7:42:00 PM
Location:
Ogden, UT
Author:
Rick Morgan
Categories:
Locomotives:
UP 3999(SD24)
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