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Sorry for the delay - bad week at work.  Give me some time & I'll get back to this.  I haven't forgotten this.The basic layout that Cabbage thew out is correct.  For voltage regulation there's a 3-terminal adjustable voltage regulator available cheap, puts out about half an amp.  A filter capacitor is not required, most train power supplies and battery chargers lack them.  As for the fluctuating speed of the locomotive, that would depend on the stiffness of the batteries you're using and the drive control.  If the drive control operates independant of the battery voltage (current control) then it becomes a non-issue.  Nickle-metal-hydride batteris are failry stiff and compact.  Ni-Cads are a tried and proven battery, with less energy density, not quite as stiff a supply, but also lower cost.   Time to get back to work.Mark in Utah
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