The layout is intended as "appetizer" for the grandchildren (and for other childs at exhibitions) since the main layout is not meant to be child-allowed.
In the basement, the track is placed in a play-friendly height under the other sections
Drawing
Overview picture
How the section is located
The location with its own digital control unit under the main layout hopefully makes the little driver feel on the track.
Detail from the layout
Building permits are issued for more buildings when the grandchild is old enough to be involved in building. So far, a few construction machines keeps the interest active.