This model (they come as packs of three) represents an 8ft narrow gauge flat wagon. It is a freelance design and is not meant to represent any known wagons, although wagons similar to this would have been found in many rail served factories, mills, and quarries.
The wagon can be painted using most common modelling paints (I use a mixture of Humbrol, Model Color, and Tamiya acrylics). To complete the wagon you will need to add wheels and couplings. The wagon was designed to take 5.1mm wheels from Parkside Dundas, specifically PN62, and the model includes slots in the buffer beams designed for use with Greenwich Couplings.