Ok, my son is crazy about trains.  So for Christmas, we bought him an Athearn train set with a DC locomotive. We also bought him a Bachmann DCC steam engine with tender and a digitrax controller. For Christmas morning we just set up the Athearn loop with the DC controller that came with the set. It ran perfectly. So today I am trying to get the Bachmann DCC controlled train running. It's running on the same track as the Athearn. I'm sitting here looking at the DCC controller connected to the track with the Bachmann train sitting on the track. Initially the train would run but stall at the same two points on the track loop. But now the train will not run at all. All the sound functions still work, but the train will absolutely not run. As best I could tell, the little copper strips are in contact with the tender axles. 
If ANYONE can offer suggestions, I'm all ears. My kids coming home soon and is expecting this thing to be running.