There are all sorts of O-tinplate operating accessories out there, stuff made recently as well as the vintage Lionel pieces. For young kids that's what you want.
So far as I know there are no "operating" On30 cars - On30 is O scale, narrow guage on 30-inch gauge track which happens to be the same distance between the rails as HO scale standard gauge. You could use the same O-scale structures and the like with them, though.
So far as I know there are no "operating" On30 cars - On30 is O scale, narrow guage on 30-inch gauge track which happens to be the same distance between the rails as HO scale standard gauge. You could use the same O-scale structures and the like with them, though.