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!