Amount of power has nothing to do with how much rack you have or how long the sections of track are. It has to do with how much power will the stuff on the track consume. If you use proper wiring techniques with higher current feed wires that distribute the power to the tracks via multiple lock ons or direct track feeds you don't need any more power than you would for a small oval. Track is a lousy conductor of electricity and you should not try to use a single lock on/feed for a loop unless it's really, really small. I use two feeds for the Christmas layout and it's only a six by ten foot oval.
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