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Ed is absoultly right! Don't use an AC power supply! Since AC is alternating current the train will try to change directions 60 times a second and the resulting heat will burn up the motor!!! <br /> <br />If the output of your 3amp supply is DC then you could use it to test your layout. Doubt that you would have much control over the train's speed as the starting voltage of such power packs is somewhere around 6 volts. For modeling railroading purposes the output of a power supply is generally measured in AMPS for DC current and WATTS for AC current. Keep in mind that a DC motor will only draw as much current ( absent of a short circuit or overload) as it needs to operate under a given load. Consequently a 1/2 amp motor will not burn out if connected to a 3AMP DC supply provided there is no short circuit or overload. You might want to consider getting one of the books on basic wiring for model railroads as all of this and more is covered in them. It will save a lot of headaches "down the line"!! Also invest in the best powerpack you can afford! Hope this helped....Vic <br />
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