I never personally was into model train sets, but I had a ton of friends that were. A man in England has taking the hobby of model railroading and combined it with the technology of 3D printing. What he got, were some truly incredible model trains, and a very nice railroad set. He uses Shapeways in order to have his trains and some buildings 3D printed. He then assembles them and paints them the way he wants. Read more about this at http://3dprint.com/10135/3d-printed-model-trains/