Danr posted:Great find, Marty.
Steel wool, yikes! You couldn't find anything worse between rubbing off the rail plating and leaving metal shards to be picked up by the wheels or damage the traction tires.
Or blowing MTH boards! When the strong magnet finds those metal shards, it sucks them right up! Just put a new speaker and a new board in a customer's locomotive for that very reason. When you find this and the board has taken a dump, you know why!