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In the short term you could just try connecting DCC to your existing wiring.

If your existing wiring allows it then switch all sections to the same controller and replace that controller with the DCC command station. If not then remove all controllers, join together the wires that used to connect the layout to the controllers (check correct polarity) and connect these to the command station. Turn on all isolating sections, remove all non-DCC locomotives and switch on! Then it is worth short-circuiting each track section in turn by putting a coin on the rails, and making sure that the command station immediately cuts out each time.

Although some of the wires may be thinner than a DCC bus, each one will only be carrying the current for one train so it shouldn't be a problem. In fact it's probably work sticking with this arrangement until you've decided that you definitely want to go for DCC - and maybe even after that. While a new layout will probably need less wiring if DCC is used, changing all your existing wiring is a big job and may not be necessary.
 
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