Hello all... Am hoping to get some of your thoughts on a proposed shelf type layout. Here are the things I am thinking about: My interest is in train operations and long point-to-point single-track mainline runs. I also enjoy building industrial structures. Locomotives would be 2 axle per truck diesels in the GP series, so relatively short. Rolling stock would be 40 foot varietes. Train length would be 10 to 12 cars. Minimum radius would be 20 inches. Have attached a crude layout pic with the space available. I haven't dimensioned everything, but the space is about 26 feet wide and 20 feet deep. The drawing is roughly to scale, so other dimensions can be roughly guessed at. I will only be using the space along the walls. I realize that the 6" difference between the levels is not much, but I do not want to use a helix. And to get more seperation will require a stiff grade on the transition trackage. have considered just doing a one level layout in this space, but would like some long mainline runs as I mentioned which is why I am considering the second level. Please give me some thoughts, pros and cons of what I am proposing. I am relatively new to the hobby, and I know I should be starting small, but I know I would not be satisfied with a 4x8 layout. I am a construction electrician, so am handy with tools and such.