Super O Bob posted:I have no groved rollers. Beenvrunning on it since 1967. Arching on dirty track is what groves rollers
The arcing on dirty track is precisely what I learned as an adult. As a child I virtually never cleaned my Super "O" layout because conductivity issues were never an issue because of the copper center rail.
For me, the grooves were a non-issue, and they still are. But, the issue seems to be important to some. I would just clean the track now since, as an adult, I understand the importance.