Hello,
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I may repeat myself but managing the servo directly in the DCC++ sketch is not a good idea. It seems simple but it is not the case, you will have to modify the DCC++ sketch.
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A simple solution is to use another arduino, which will "listen" to the DCC signal, and act on the servos.
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As indicated on this link: http://www.mynabay.com/dcc_monitor/_monitor/
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Have a good day