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I think a few people are a little confused how such a system as I've proposed would work. 1. No current would be drawn by a float-charged locomotive unless the track voltge is above a certain level AND at the right polarity. For a 12 VDC internal battery (13.5 VDC float), you'd have to run the track voltage at least above 16 volts. If you're at a friends layout and he's track powered your train would have no effect, as his track voltage most likely would never go high enough to trigger the on-board battery charger. 2. The on-board battery charger should be current limited, and float the batteries at the proper voltage for indefinate connection. Again, even if the friends track voltage could go high enough, he'd still be safe from current overload. As for worrying about the track electrical conncetions, you'd only really worry about that on the storage track. The rest of the track would get a cursory clean up, and where it works, it works. Where it doesn't work, you'd never know. The idea isn't to maintain 100% electrical reliability around the track, but to only maintain SOME electrical connection, like 50%? Mark in Utah
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