MÄRKLIN 36805 KÖF II SMALL DIESEL LOCO Prototype: SKW Trostberg Industrial Railroad class Köf II. Loco no: 2 Length over buffers: 7,4 cm. Used as a small switcher. Warning: The loco is sensitive for Zincpest. My loco was badley affected, but was changed into anew item, according to warranty rules, all though it was some years old.