Atchinson, Topeka, & Santa Fe rebuilt a number of it's SD24s and called them SD26s. They differed in air brake details and had a new air filtration system. The EMD 16-567D3 engine got a 645 power assembly and the electrical system got upgraded as well. This gave them a higher horsepower rating of 2,625. My thanks to Wikipedia for the information.
Videos
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MEC 347, 377, 517, & 379, & ST 621 pull out of the siding at New Glouster with POWA on April 11th of 2005. Video by John Erickson.