One square = 1 ft. HO scale. The straight line across the top will actually be a yard, I didn't put in all the tracks. Any opinions, suggestions etc. would be appreciated. I have no idea what the elevations are going to be. Where track might go up and where it will go down. On the lower part of the picture I thought I might take the black track to the outside and the blue inside and then have the black running on a level graqde all the way with the blue going up to a 4" height and then back down. But I'm not sure where.