I'm working in "N" and "Z" Scale. I had 2 4' x 8' tables put together in an L shape in "N" scale that could run four trains at the same time with out any wrecks, Steam Engines are my favorit. That table I had when I lived in Jacksonville, Florida. Now I'm living in Georgetown, Ohio. I built A "Z" scale layout it's 73" x 32". I also like working on Trestle bridges. I've been looking for information But I guess I'll have to break down and buy a book! I have been working with a program called 3D Max8 to design some bridges.