Well, seems you meant sth a bit different:P

And now, let`s go back to our WIPs. Hope sb enjoys these awful tex-less renders:P Now some screenshot. A nice feature in Blender: by clicking the button right to the layer controls, I can render the screen to the Render window and then work with it like with an ordinary render. Thus, used this;)

A bogie with some extra stuff. Engines, brakes, etc. Since it wont be visible in most situations and will just make that "dark crowd" behind visible elements, I kept them as low-poly as I could. They are one object with the bogie frame, since it seems Blender cant make instances of object groups live.