OK, I'm a bit new at making layouts, but this is what I have planned so far: The circle is a round house and the lines are track. The roundhouse is going to be on a higher elevation and so I want to make the track below the roundhouse (the area where there are switch tracks) going through a tunnel on the side of the hill the roundhouse is situated on. I want my layout to be in a mountainous region for cargo trains (mainly transporting coal and ore). It will be in N scale. Now how could I improve this layout? Any help would be much appreciated.