Hey, I just purchased a prodigy advanced squared dcc system and two bachmann dcc on board locomotives, a santa fe and a new york central.  I hooked up the prodigy advanced to a simple oval of unitrack and neither of the trains are responding to anything even when set to adress 3 like they are programmed to be on.  The track is not short circuited and I don't knw what to do to get the trains running.  any help would be greatly appreciated.  the train just sits on the track like it is not even connected.