Before starting my layout I went to a sign shop and had templates made from 1/4 inch composite for three radii; 36, 40, and 44 inches. The roadbed was 3" wide, and was one quarter of a circle. I then bought a four foot wide roll of cork, twenty feet long, and 1/4" thick. This has saved significant time and money, and along with straight templates of 12, 24, and 36" has made track laying (Gargraves flex) according to my track plan a lot less stressful. Hope this helps you. Mike