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Ok, most DCC's companies say to shy away from overhead powered lines. Reason being, is that unlike the static rails where the wheels are always touching the track, overhead can occasionally cause some instances where the pole is not touching the wire (think bad spring on the pole, loose wire in a spot, ect). this will mean that if a signal is being sent at the time the pole is not actively touching the wire, your train may not get the command it was told. Mind you, if you wire correctly and make sure the pole will always be touching the overhead wire, you can effectively Use DCC with an overhead cantanary system.
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