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The real question about power is how a transformer/power controller are rated. You need to know the total VA output of a transformer in order to know if it will have enough power for your needs. VA is simply a measure of Volts & Amps. It tells at what voltage will you get what amperage. For instance a 120VA rating will only provide 10 Amps at 12 Volts. If you use John Busby's advise of minimum 10 Amps then you really should look for a power supply with a minimum VA rating of 240VA (10 Amps at 24 Volts). I am biased toward the Bridgewerks power supplise (www.bridgewerks.com) They are a fantacstic company that offers a 5 year warranty and offer models up to 600VA more powre then any other controller maker on the market. Other ways to get more power out of any transformer is to run multiple connection points to the track (be careful to keep the proper polarity at all points) using thick wire (10 -12 gauge is best) This will help minimize voltage loss in the wire and smooth out power fluctuations in the track itself (the farther the train is from a connecting point the lower the voltage will be due to resitance in the track). Also remember that a locomotive will only draw as much current (amperage) as it needs. Kstrong's post is correct only when it comes to Voltae. You can apply to much voltage to an engine but you can not apply to much current (amps). A final word - clean tracks make for better connections so be sure to clean your track periodically as well. This will help keep your trains running more smoothly.
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