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To expand on that, in the model rr world "plug-and-play" is usually used in the context of DCC systems, such as add-on boosters that you just plug into your existing DCC system to add power. More commonly, PnP is used to refer to drop-in decoders that go into a locomotive with a minimum of fuss, such as those that plug into a DCC socket already present in the loco, or a board that easily replaces an existing light or control board in the loco. <br />
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