One comment: if you start with the lower level track at the highest part of your diagram (top) and run counter-clockwise, you have no crossovers that will allow a train to run through on to an inner track. All you can do is "loop" on that track when running counter-clockwise, whether you go through the left wye leg or the right wye leg. I know that the current design allows for multiple passing sidings, but without an adjustment, the only way to get that train running on the outer loop to run on the inner loop will be to back it through a crossover.
Chuck
