There was a period, when I was playing lot of train simulators. One of such games were series of Trainz Rail Road Simulator (TRS). At that time, I was fascinated with steam powered trains. I have decided, to make as accurate as possible 3D model, of OL49-111, for a game, so I could actually drive with it. I made it, it worked and also many people did enjoy it as well. There was few 3D steam trains models at that time for such game, as they were complex to make, because of multiple moving parts.