Joe - this looks like an interesting project and the advice from Stan and GRJ is always spot on... One thing you might consider - as you think about going the route of having one battery and a set of tethers to all the cars - would be to set it up so the battery pack doesn't have to be removed to be recharged. It sounds like, in your case, that the baggage car might be a good choice because you can install a larger battery pack inside the car (I assume that the passenger cars all have interior detail so finding a place to hide a battery isn't easy). The advantage of being able to recharge the battery pack without having to remove it is two-fold - one, it avoids having to mess with taking the shell off the car every time, which also avoids the problem that eventually something will break or wear-out. Second, it also means you would be able to recharge more often (by virtue of being easier to recharge), and thus not have to make all the compromises Stan outlines as a way of maximizing battery lifetime. Just a thought...
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