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Short answer.  The Js were needed for two reasons--lots of horsepower for the curves and grades in the mountains, and also to be able to make time on the flatlands.  There were several places on the N&W where 100mph passenger train operation was the rule rather than the exception.

The Class K 4-8-2s were having issues with expanding train lengths on the Roanoke to Bristol line--not an easy stretch of railroad, with lots of curves and some fairly steep hills.  The Class A could certainly pull passenger, and did so many times, but it's slightly overkill to run a large articulated on a 7-10 car passenger train.  Anyways, N&W needed the As for the mixed freight.  They needed something in the middle, and thus was born the Class J.

Two engines built for two different purposes.

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