These are travel agency display models, and in fact beautiful ones! Same as Anthony I first thought we are speaking about toys, but that aren't toys at all, at least no toys for younger boys...
This Britannia is on same level, if not better than the European models from the well known former makers in the Netherland.
I guess, these are very very rare and it will be hard to find out, how the stand looked like.
There is a company Tenshodo existing until today in Japan, which still produces model trains. Don't know, if this is the same company formerly producing that models.
I am really impressed!