I have just started with DCC, no problem programming the two engines. I have 2 separate oval tracks and both engines works when addressed. The problem is that the tighter loop has a dead spot the same place on both straightaways. When I tap the engine it starts right up, the headlight stays on. I have switched out the straight track (one of the pieces of track is brand new out of the packaged and purchased with the engines 2 days ago. I have engines 51804 and 51803, 2-6-0 steam engines. I have put a track cleaning car on the track also. The connections between the sections see fine also. any suggestions. Thanks Ed