Weren't most/all calves converted into full-fledged "cows" with the addition of a cab and controls? A point of perhaps side interest, the Burlington tried a cow and calf set on their rugged Black Hills line, in an attempt to replace T2 2-6-6-2's. That was unsuccessful, as they were superceded by 4 unit F's, and ultimately SD7/9's. The 2-6-6-2's remained in service into 1951.
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