Glad you have a chance to see this. This one is for all you "loopers"! Jim (the builder) is a friend of mine from St. Paris, Ohio. He built a large pole building a few years ago to do things of this nature. I believe he did a world record long HO train. Something like a couple thousand cars and forty five six axle units. He has several videos. Doug
I've seen some of his earlier videos, but this one is new. The spiral seems larger than previous iterations, plus he's added an off stage loop and a couple switches. I forgot to count how many engines he used. I think the last one I saw he used seven. He has become a real master of this genre, always upping his game.
And yes, it is hypnotic.