I have a project I want to do. I want to out lights in some old cabooses I have. I know I could just buy lighted cabooses, but that's no fun. I am having a hard time finding power trucks; that is, trucks that will pick up track power. I have looked on eBay, but they are scarce and pricey. I have checked ERR, but no luck. I have checked train shows with little success. The ones I found were wore out. Any suggestions for sources.