Hi Pat I have to agree with Gary to a point. There is a way to get more sidings in a narrower space, and you have the perfect layout to use it. It's called a pinwheel and this thread shows how it works (post #6). This is a layout I originally made on Atlas' Right Trak software so it is in scale. I just photoshopped it into a jpeg for ease of viewing. All of the switches are Atlas #4 except the ones coming off of the mainline. You probably won't get more than a couple to switch back to the mainline, but the dead ends can be used for classifying and sorting. By the way this is an N layout and the grid is 1'. However you should be able to adapt it at least partially to HO.