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Yes mate this is a big subject and I am tired of going over it all; try to find some of the things that have been said in the past about this subject in the archives. Basically you need to know a number of things A) Do you need a transformer only, AC output. B) A DC power supply, with just a DC output. C) A variable DC power supply with an output which has from zero to about 20 Volts DC available; and as well the ability to reverse the polarity; so you can vary the speed and direction of your loco's. D) Size is important, so find out or decide how many and how much power will be drawn from your various loads, ie locos lights signals etc and this wil determine its size, expressed in watts, VA or even amps. Rgs ian
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