suitable for children only after upgrade

Also I have so bought a train for my son, or get paid, and am also upset
that the parts can only be placed one above the other and even the slightest shake the marbles do not
more druchlaufen and snagging. But I have thought me a solution and anxious which is cost effective and eliminates the problem. I have little plywood rings which were precisely cut with a laser, glued to the bottom, and now you can see the parts stuck together and prima nothing more blurred.
If you are interested you can search on the net with the search engine of their choice to:
"Holzringe as improvement for Eichhorn wooden ball track"