Brim, which is used to improve bed adhesion. Works withCode 75 andCode 100 rail. Should also work with Code 83 (not formally tested).
OO Gauge Track Template Kit – Choose Any 10 | Radius Tools & Straight Guides
OO Gauge Track Template – 24″ (610mm) Radius | Pack of 3
OO Gauge Track Template – 36″ (914mm) Radius | Pack of 3
OO Gauge Track Template – 22½″ (571.5mm) 4th Radius | Pack of 3
OO Gauge Track Template – 17¼″ (438mm) 2nd Radius | Pack of 3
OO Gauge Track Template – 27″ (685.8mm) Radius | Pack of 3
