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12/20/2024
 
 
 
 
 
Owner: Union Pacific Railroad Company
Model:EMD SD24Built As:UP 423 (SD24)
Serial Number:25381Order No:5602
Frame Number:5602-A24Built: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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UP's Experimental SD24
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
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Locomotives:  UP 3999(SD24)
Views:  821   Comments: 0


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