Hello,
this is a model of a HO scale railway wagon, that can make 3 different wagons:
I doqnloaded the rendering model and made some changes to make it 3D printable, as well as split some parts to be able to print it eithr FDM or SLA.
I use this kind of wheels: https://www.aliexpress.com/item/32837729114.html?spm=a2g0s.9042311.0.0.27424c4diQNhS9
but you could print your own, as it is not required to be metal.
The author hasn't provided the model origin yet.