I model HO steam and diesel. My layout is an around the room type and measures 9 x 12 feet. Depth is 30 inches. I just got back into the hobby and learned how much it has improved since I was a kid. DCC is amazing. I have a Digitrax Zephyr DCS52 and an NCE Powercab controller. I have learned a lot in one year but there is so much more.