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I've been studying the same problem with the layout I'm designing. The key is to isolate and size the reversing block so that only one train would be in it at a time. You can have multiple blocks with DCC but I think you will only need two for what you are planning. Take the section of track which causes the reverse loop and separate it from the rest of the layout. Hook up the reversing module to that section only. The rest of the layout can be one block. When the train enters the reversing section, the reversing module will flip the reversing block to match the polarity of the track the engine is entering from. It will do the same thing on the exit side. The decoders keep the engines moving in the forward direction regardless of polarity.
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