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Hi Broncoman the pronunced bump was changed when the design of the frames was modified in 1995 or 1996. The bump has now another style with a hole in the middle. In the main construction the truck´s are identical. The three UP AC4400´s #6885-6887, delivered in November 1995, were originally equipped with GE’s design for self-steering radial trucks. UP 6886 was retrofitted with standard HiAd trucks in late 1997. I think I read in an article that today both others are retrofitted too!
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