Designed to work in concert with the set of other cars:
https://www.shapeways.com/product/88CRD83ES/rokuhan-shorty-railcar-set-zscale
NOTE: this model has seats for the top floor, but if you use them, you can't put a powered Shorty chassis inside. Instead, you have to use the unmotorized chassis ROK-SA003-1, and you will have to cut the sides of that chassis down some to avoid hitting the floor of the seats