This train wagon paper model is designed by schaalbouw. The GLG coal wagon was build for the Dutch "Staatsspoorwegen". After the merger of several local railroads in the Netherlands into the "Nederlandse Spoorwegen" it was relabeld into the GLG class of coal wagons.
The model is designed to be printed on 160 grams waterresistant photopaper. Additionally some cardstock is needed (0,5mm thick). A printable rear side is supplied. When properly alligned this rear side colours the back side of the parts which are visible on both sides.[via schaalbouw.nl]
You can download this paper model from here: Train Paper model: Coal wagon GLG free download