I have an old MTH Christmas trolley that is operating erratically. When I first operate the trolley, after it has sat idle for a few hours, it runs very erratically around the track, jerking, stalling etc. The operation looks like classic dirty track, rollers or wheels because the interior light blinks with the jerkiness.
I have cleaned all of the rollers, wheels, and track twice using a Dremel on the rollers and wheels but the jerkiness remains.
What is very odd is that if I run the trolley around the track about 5 or 6 times, all of the jerkiness disappears and it runs absolutely smoothly and the interior light never flickers at all. The characteristic jerkiness during initial operation and smoothing out after 5 or 6 times has been present ever since the trolley was placed under the Christmas tree in late November. It is very repeatable.
Any ideas what is causing the jerkiness?
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