I put all my yard storage tracks on switches so I can park engines there and turn off power to the tracks. If you will only park cars there then I wouldn’t worry about it. I use one PW 180 on my medium layout and and it works great. I’ve ran 5 engines at the same time and no issues. I don’t use smoke and I don’t have lighted passenger cars. If you do that could affect how much power you need. I agree, that is a nice track plan.
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