My late grandfather had an N scale layout in his basement. I remember going over there as a little boy thinking it was the greatest thing in the world to go down there and run trains.
Grandpa had a slight case of arthritis, and the doctor recommended that he take up a detailed hobby to keep his hands and fingers busy. You don't get much more detailed than N scale model railroading! Anyway...the layout wasn't fancy, just two 4x8 sheets in an L shape. He wasn't very artistic. Some of the trees were just small pine cones painted green, though most were modeled. All the structures are the Plasticville kind. And he didn't pay tribute to any particular railroad or era, the entire roster was mix and match. But I didn't care. It was fun just because he made it fun. Half the layout still exists today. He sold the yard/industry portion shortly before his health started failing. From what I know, a train hasn't ran on it for at least 10 years.