I found this motor on a popular auction site. It seems like it might be a good choice if the original one is really bad. BTW the drivers should be about 1.625" I'm not a fast runner, I've been advocating lower gear ratios (slower) for years. But if you want RPMs you need more voltage! Even Lionel's 700-series Hudsons were rated for 20 volts. I'm pretty sure Right Of Way developed its 16-amp, 24-volt transformer with these Williams locos in mind. Circa 1990, that's the way the hobby was going. Those transformers still command a good price when you can find them.