There are two ways to gain elevation on a model railroad. You can make risers and inclines out of plywood or you can do it the easy way and use these Woodland Scenics flexible styrofoam risers and inclines. As you can see, I chose the latter option. Why fart around with trying to calculate gradients and all that jazz? I prefer to let WS do the hard part. I used four sets of 2% inclines, which raise the track four inches over sixteen feet. I added another four sets of four inch risers. At any rate I pinned the risers to the layout base with some brads and traced their outline with a sharpie. The next project is to glue them down and cover them with plaster cloth. After that, we're finally ready for track.