Hello, Really need your help. We've bought a load of new track, a new DCC digital controller and a new piece of power track to connect the digital controller to. When we put the train on it won't move. There's a whirring noise coming from the train..we've tried a few trains but it's the same problem every time. If I take the wires out of the digital controller and just touch them on the 15v the train will go around the track. It's almost as if there is t enough power going through to drive the train. I know the trains work, the track is brand new and so is the controller. I've only made a small oval of track so it can't be that. Anybody have any suggestions please.