I honestly didn't think I'd ever find anything as sketchy as this:
http://rcdb.com/3436.htm?p=0
But I think this one is a strong competitor. I would actually like to see a POV.
One could easily reach up and touch the track or bump their head on it if they were tall enough. Also is it just me or is that support beam actually not perfectly straight? (The one next to the plastic chair).
The fact that the track has no spine is off putting enough but it looks to have only one single cart that can seat 1-2 people. Not that I have to worry about lines given how tame and sketchy it looks, but that one single cart is probably needed because any more seats would be too heavy for the track.