I had a video of R and me playing with the track, but it was still uploading after 2 HOURS, so I gave up. But here are some still photos.
Here is the entrance to the track, atop our heavenly squishy armchair.
R made use of his car wash that he and A built together two weeks ago with Legos. I had the brilliant idea to put it on top of R's kitchen stool to create an incline so that the cars could make it through the next stage: the corkscrew loops. Always thinking I am. (LOL. Wow - I have turned into Yoda Mommy.)
Here are the double loops and the pile of cars who, sadly, didn't make it. Actually, the real pile-up occurred at the base of the first loop, but this is what things looked like this morning. Note that R also sent two trains down the track. He experimented with many different vehicles, some of which smashed the smithereens out of the car wash and required Mommy to do some speedy Lego repairs. :-)