I'm restoring the Blue Comet Observation Car (6-9540) and can't get the lights to stop flickering as it rolls along the track. I've taken it apart, checked the connections, and taken the axles out to polish them up for a better connection. It's helped the issue but not solved it. Could the roller be the problem? The wire connection is good-but-could the roller simply not be making good contact? How can I make it better?
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