1 The clinic began with a definition of micro layouts, emphasizing the fact that they are usually less than four square feet in area and that they represent a self-contained, working railroad. They can be made in any scale and any shape or size, so long as they don't exceed 576 square inches. Some things that Micro Layouts are not: they're not 1:900 scale toys, nor dioramas, nor modules that assemble into larger layouts. NEXT > RETURN TO HOME PAGE