What I have is a DC controlled engine and I ended up buying a DCC sound value engine. Found out I can't run them together without converting the DC one over or just run the DCC on the DC controller and not get the full effect. So I have to choose which way to go. Spend more money or trade back for two more DC engine to run together. Bottom line is , I wanted two to three engine to run tandem on the same oval track and get sound.