Hi Jeremy,
Seeing that you are running AC, and have a Lionel KW, I suspect that You are running 3 Rail O-Gauge, come on over to the Classic Toy Trains(CTT) forum, you will get more and better info & advice over there.
Using a KW should not have hurt your Railking locomotive, what is it doing/not doing, that makes you think it is fried?
Doug
May your flanges always stay BETWEEN the rails