Okay gang here's the rub... I want to model an HO scale table-top island style layout (I know, I know, I can do what I want a lot better with a shelf layout...) where I can watch the trains go round-and-round. What I want to know is this: what is the minimum allowable dimensions/size of the table I could have yet still run the long, modern, six-axle diesel locos on an outermost loop? Can this be done on an 8x4? Or a 9x5? How close would the track come to the edge with these? And no I don't want to switch to N scale or point-to-point, etc. Thanks everybody!