I Wish Tomy Would...!?

This could be down to that type of wagon not existing in Japan maybe? Ultimately the PlaRail range is based on the Japanese locomotives and rolling stock so they are unlikely to model European or USA type rolling stock.

I could of course be barking up the wrong tree, but knowing that Japan primarily generates electricity through nuclear they are unlikely to ship much coal around (which would mostly have to be imported probably) and they probably use more rice than wheat etc... so there may be less movement or different types of rolling stock to move grain around