What is the fine-grained topic of the following text: And for the record: - the prototype drove very well on regular Ninco track without magnet a year back when I was in Reggio, and they have made improvements since then for the cars you may have seen on video at Nurnberg - and to the track system over stock Ninco. Only return the topic.
Improvements to a prototype car and track system for magnet-less driving on Ninco track