Built to carry steel, mostly in South Wales, Tops code OUV and some with air brake through pipes fitted, coded SUW and used on continental traffic. They travelled with a tarpaulin hood supported on a framework over the load. The body was kept in place by longitudinal springs to absorb impacts while shunting, and for this reason is appreciably shorter than the chassis. The model is designed to fit on Parkside Dundas 12 fit chassis which may need the top solebar flange cut back to accept the spring covers. Wires will need to be fashioned to make the sheet supports, and grounded in the (fixed) sockets in the hinge blocks on the ends of the body, and Rizla paper cut, folded, fitted, glued and painted to make the tarpaulin. When the trafffic they were built for declined, many had the sheet support and shock absorbing apparatus removed, and with other modifications were used in the engineers' fleet to carry ballast and sleepers, codenamed DACE. UPDATE The print is lovely and no changes are needed to the 3D model itself. The sheet rail wire holes do accept 0.25 mm brass wire without clearing out with a drill (they are designed to take 0.33 mm. which might need a very careful clean with a 0.35mm drill first) but there must be no burr on the end of the wire. Do not apply force. You do need to cut back the middle section of the upper solebar flanges of the chassis kit to accept the spring covers. I broke the piston rod off one of the vacuum cylinders while fiddling with the wheels, so I'll need to glue it back on, or drill a hole on the cylinder of around 0.65 mm diameter and push a short length of plastic rod or wire in to replace it. The model is also suitable for the Coil L conversion undergone by some of these wagons in real life. It seems that just the shock springs were removed, and cradles fitted inside to hold steel coils.