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On a DCC layout only one engine of all the engines on the layout can be analog (DC) the rest have to be decodered. So if you have three engines running, one can be DC. If you have one hundred engines running, one can be DC. <br /> <br />So when you buy your first DCC system and if money is tight and you can only afford one decoder after you buy your Digitrax or Lenz, then you can run two engines - one DCC and the other DC.
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