At the beginning of the 21st Century, the least Utah Railway had on their SD40s expired. In 2001, they received six MK5000Cs. These unique units were rebuilds by Morrison Knudsen. In 2003, their MK prime movers were replaced with EMD prime movers and they were redesignated as MK50-3s. At the end of 2016, Utah Railway lost their last coal contract and a century of coal hauling for the railroad came to an end. As a result, their MK50-3s are being sent to the KYLE railroad in eastern Colorado.
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