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[quote]QUOTE: Originally posted by foamer13 Doesn't anyone make a tiny adjustable resistor (rheostat, potentiometer) that could be put into one of the the motor leads? That would go a long way toward matching the locomotives' speeds. [/quote] Much better than a resistor is the usage of an "anti parallel" pair of simple 1Amp Diodes which should be switched in series with the motor. "Anti parallel" in this context means that both diodes are connected in parallel but with different direction thereby allowing current to pass in both directions through the motor. --+-----------|<---------+----- Motor -------------- . +---------->|---------+ In such a circuit the normally used feature of a diode to let current pass only in one direction is not the focus (even unwished here), but it's characteristic to decrease Voltage (for silicium usually 0,7V). The main advantage over using a resistor is that while the Voltage is decreased, the ability to let current through the motor is not decreased, which is important to retain "tractive effort" especially in slow running. By using more than one pair of diodes even the fastest runners could be tamed. --+--------|<----|<----|<---------+----- Motor -------------- . +-------->|---->|---->|---------+ Have Fun!
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