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You didn't say what scale - so I presume HO. I would go with 20 amps, the reason - you may decided to add options you never planned on now, or even thought about. Tastes in layouts have a way of changing as you become more experienced and more knowledgeable in the hobby. <br /> <br />You never know, you might be interested in computer running of some of your trains, computer running of trains in and out of staging. You might want extensive signalling, and animation, and... and .... and... <br /> <br />Its the easiest now to add what you think you are going to need down the line. I would not have the lights on the same line as your main power serving the layout - if you can help it. In my situation, part of my layout is independent power with two lights on that electrical circuit.
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