Unusual sensitivity to voltage drops: Roundhouse-MRC Engine I bought a Roundhouse 4-4-0 engine ready to run with an MRC sound controller a few weeks ago. I use it at the club I just joined. It runs great on 95% of the club track. However, there are two sections where it either barely moves, even on full throttle (no incline), and makes a clicking sound from the speakers, and another spot where it moves in jerky movements, where the engine seems to cut out for a half second at 2 second intervals. In both of these situations, the headlight remains on full and does not blink at all. No one else's engines have problems in these areas. The track voltage throughout the system is between 12.5 and 13.1 volts. The wheels are clean. The track is clean. Except for these two areas, which are each about 10-12 feet long, the engine runs smooth and predictably. At first I thought it was a voltage drop problem. But the voltage is actually about .2 or .3 volts higher in these trouble areas. Could it be some form of RF interference in these areas? How would I trouble shoot this problem? Or is it clearly a defective controller in the engine? Like I said, no one else's engines (and there are dozens) have problems on this layout, especially at these locations. Any ideas ?