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Piercedan makes a good point - if you run engines that do not require a lot of power and are not pulling a lot of cars then you can use a smaller power supply. If you are looking to get a power supply that you can run almost anything with then opt for a power supply with a high VA rating - something of 240 or better if you want to go with the 10 amp rule (240VA means you can have 10 amps at 24 volts). Not all power supplies have the same build quality either. I have seen the insides of some units that have, for lack of a better term, spaghetti wiring (a big mess which means lost power in the power supply. Also have seen "floating components" that is a omponent of the power supply that was only held with internal wiring - a very dangerous method as that can lead to shorts and possible electrocution. Best bet is to get a power supply that meets your needs, your budget and is a quality product.
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