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Ah, but it depends on how you charge the batteries. The secret to get a system to work as I'm proposing is to put the voltage regulator in the locomotive, and not on the track power supply. For instance, if you need 13.5 volts across your batteries (common 12V lead acid battery), then you'd calculate your track power supply voltage as follows: 13.5 volts + 2 volt drop (regulator) + 3 volt drop (track) = 18.5 volt minimum supply voltage. If you put 20 volts on the track, and have the voltage regulator (the battery charging circuit) in the locomotive, you're in like flint. This type of thing is done all the time in other industries, just hasn't been applied to model RR's. Mark in Utah
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