My Lionel ZW (post war), which I bought used about a year ago, has an issue where the red light lights up (circuit breaker trips) without good cause -- at least a good cause that I can find -- when I use my2037 and 2046 engines together. It doesn't happen if just one circuit is going, and it doesn't happen if I use one of these engines with a newer (90s) Lionel engine that doesn't draw as much. I've gone through a process of elimination, using different engines, different cars, disconnecting and reconnecting the Gateman, using different lockons etc. Seems it's simply an issue of the transformer not liking running these older engines together. I also notice that when I have just one set going, when I turn on the other set the first slows down. Is this normal for a ZW?