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I would say the solution to future expansion would be to install power busses under the layout from the start - this will allow you to add DCC accessories (such as switch decoders, signals, etc) with very little upheaval. The one thing I'm not sure of is whether it's ok to power and control switch decoders from the same bus as your track? I'd be a little worried about voltage drop doing this though I've not tried it. Hope this is of some use!
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