Awesome Trick Video Editing!

The wagons are HoKi (ホキ) 1000 or 1100.



The logo is 太平洋セメント T = Taiheiyo Cement.

There are several manufacturers of N gauge versions,



But they don't look like the ones in the video, and in any case they'd be too small.

Digging further, @shimotan53 posted this on 26-Mar-16.

"I was motivated by a certain person's red hoki and tried to make a prototype".


Then: "I made 16 of the white hoki because it's a structure that's easy to make from 0.5-1.0mm plastic board".


Later: "I use a 0.5mm plastic sheet rolled up. If you put it into the core of a toilet roll and leave it in the car under the scorching sun, it will get a firm curl. The white hoki was made using this method".


and: