I just bought an old Lionel 623 ATSF switcher at a train show, and it's in pretty nice shape. It runs great, except that the pickup rollers are sparking like crazy! I have opened the shell and thoroughly cleaned the motor, armature plate, brushes, etc. Cleaned and lubed everything, including the wheels and gears. I'm running on standard O tubular track, and have cleaned the track. Many other locos running on this same track, none spark. I even have now replaced the pickup rollers and roller arms ... no improvement. Running at slow speed is OK, but medium and up, the heavy sparking begins? What to do??
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