N scale Last Final Version???? I did some rethinking and came up with a new plan. Then I remeasured the room and one wall shrank two feet so back to the drawing board. Here is my latest "final version". It is N scale and the grid is 6". It has two layers with helixes on either end leading to hidden staging on the bottom. Upper layer Lower layer The shaded area indicates an excess of 24" from an edge. I tried to avoid putting any potential trouble spots in those areas and leave it mostly for scenery. I haven't decided just what industries I will have, but it will most likely be light manufacturing etc The industrial area will be served by a local that will operate out of the main yard which will act as an interchange for either two major lines or one major line and one or two branches. There will be aprox 8" of clearance between the two layers and the bottom will be no more than 12" deep so I shouldn't have too much trouble accessing them. I would appreciate any comments or criticisim or pointing out any obvious mistakes I made. ps: the helixes will be 2.75 stories, not 2.85. Caught the first mistake.