@H1000 posted:I'd suspect that the passenger cars are not the issue but rather the amount of current needed to run the lights in those cars. Our Z4000 noted over three amps to run the whole set and nothing else on the track. If there is a severe voltage drop due to high current draw, that could be the issue, but this is only an educated guess at this point.
I have the sense that Susan is reasonably well versed in the operation, have you looked at her website? I'm pretty sure she would know if the power was overloaded. 
