Not a resistor, but rather some diode pairs. I normally use a couple of bridge rectifiers connected as diode pairs for this job. 3A models are sufficient for this task. refer to the diagram below, if you connect the + and - leads together and connect the wire to the motor in series with the bridge using the AC inputs ~, it'll insert about a 1.5V drop in the motor voltage. If you use two bridges in series, it'll drop the voltage around 3V. This will assist the smoke and also tame the engine at higher track voltages. You can put addition al bridge rectifiers in series if necessary for even more voltage drop.
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