Union Pacific Light Challenger

The Union Pacific Fetter Challengers were a class of 4-6-6-4 "Challenger" Locomotives built for the Union Pacific Railroad.
==History==
===Inception===
In the 1930s, the Union Pacific Railroad needed a new class of locomotives to tackle the mountain passes of Sherman Hill and the Wasatch Mountains in Utah. Their largest Non-Articulated Locomotives at that time, the 9000 Class 4-12-2s, were tried out but couldn't handle the tight curves of the route due to their exceptionally long rigid frames.
===Construction===
Arthur H. Fetter went to the drawing board to create a new steam locomotive by splitting the 12 driving wheel frame in half and have it joined by a hinge-pin in the middle so the engine could bend around tight curves, enter the Union Pacific's Fetter Challengers. They were classified as "CSA-1" and "CSA-2". All members were built by The American Locomotive Company (ALCO).
===Disposition===
Sadly, all 40 were retired from active service when the Union Pacific Railroad began to dieselize their lines. Although Union Pacific's 4664 Class No. 3977 and 3985 were preserved, all 40 of the Fetter Challengers were scrapped.
==Trivia==
*Some chose to call them Light Challengers after the heavy challengers were constructed.
==Stock list==
Number	Photograph	Build date	Notes
3800 	 	1936 	
3801 	 	1936 	
3802 	 	1936 	
3803 	 	1936 	
3804 	 	1936 	
3805 	 	1936 	
3806 	 	1936 	
3807 	 	1936 	
3808 	 	1936 	
3809 	 	1936 	
3810 	 	1936 	It was originally numbered #3910, but then in 1949 it was renumbered to #3710 because of a coal strike.
3811 	 	1936 	
3812 	 	1936 	
3813 	 	1936 	
3814 	 	1936 	
3815 	 	1937 	
3816 	 	1937 	
3817 	 	1937 	
3818 	 	1937 	
3819 	 	1937 	
3820 	 	1937 	
3821 	 	1937 	
3822 	 	1937 	
3823 	 	1937 	
3824 	 	1937 	
3825 	 	1937 	
3826 	 	1937 	
3827 	 	1937 	
3828 	 	1937 	
3829 	 	1937 	
3830 	 	1937 	
3831 	 	1937 	
3832 	 	1937 	
3833 	 	1937 	
3834 	 	1937 	
3835 	 	1937 	
3836 	 	1937 	
3837 	 	1937 	
3838 	 	1937 	
3839 	 	1937 	
Category:Scrapped locomotives
Category:4-6-6-4 locomotives
Category:Fetter Locomotives
Category:Tender locomotives
Category:4-6-6-4 steam locomotives
Category:Scrapped steam locomotives
Category:Locomotives
Category:Union Pacific locomotives
Category:United States
Category:Steam locomotives
Category:ALCO locomotives
Category:American locomotives
Category:American steam locomotives
Category:Built in 1936
Category:Standard gauge locomotives
Category:Built in 1937
Category:Articulated locomotives