This is a H0 scale model of Cairo & Kanawha RR boxcar no.5.
The original was 3 foot gauge, but was small enough to be at home on a 2 foot or 30 inch gauge line.
Some 1mm thick (0.040") plastic card is needed for the roof, plus wheels, couplers and detail parts to complete (see instructions).
This version includes trucks designed for American N gauge wheels. These should be carefully removed first.