I had a reply from the publisher of the video.
"This gaege is 9mm.(figures size 1/87) This is powerd from rails. I maid this model. Sorry,I can understand English very very little."
Busch make a NG System that runs on Z gauge Track. The Locomotives have strong magnets to help with pickup and are even capable of climbing vertical walls. Possible that this system was used in the creation of this Piza. See the following link:-
http://www.pecopublications.co.uk/New-ready-to-run-Narrow-Gauge-on-Z-gauge-track.html
JonD
True, but scroll down the bottom of the page and look at the underside of the green tram and there apears to be a magnet in the middle:
http://www.ecodacs2.nerima.tokyo.jp/rehsi/essya-ensenhuukei.html
note that the picture of the pink tram alo has something there but it looks like a button battery.
Now, compare the dates of the Japanese pizza and the Busch, quite a difference.
I remember my Hornby locos having 'magnadhesion' but I can't see a Brush 4 doing that!