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I think most people have tried to charge the batteries from the rails by trying to maintian the voltage at the power supply.  Correct me if I'm wrong.  If so, this is fundamentally flawed and won't work. Has anyone tried to mount the charging / voltage regulation circuitry in the engine, and float charge the batteries by monitoring their voltage locally?  You'd run the track voltage, at lets say 18 volts, and regulate the voltage at the proper 13.7 volts across the batteries.  It would be failry easy to create the circuit to do so that would maintain the same voltage accross the batteries when idle or at full load.  Only when the track power disappears would the battery be called upon to run the locomotive.  No over-charging could occur.  I'm an HO modeler that has toyed with going to G for the yard.  I'm also an EE in the power industry, so we run into this sort of thing all the time but at MUCH different scales.Mark in Utah
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