From looking at the Upper Silesian Railways website -
Upper Silesian Narrow Gauge Railways - it appears that they run an LXD2 loco, which would be easy to make as a paper model in this scale. I've got hold of some drawings, so I'll have a go at that as soon as I can.
UPDATE: I've found a model of this loco, at a scale of 1/64th, quite a simple model, but could be a start.... See
Pobieralnia – free download – darmowe modele - near the bottom. (There are quite a few other trains to get there too!)