 Amongst his designs were such well-known types as the Class 30 operated by the Vienna Stadtbahn, the "Atlantics" of classes Class 108 and 310, and the ten-coupled ÖBB Class 380. Notable 'special' designs included the rack railway locomotives of Class 269 for the "Erzbergbahn" and the narrow gauge Yv for the "Ybbstalbahn".Karl Gölsdorf continually utilized the emerging technologies of the time.His Class 310 locomotive of 1911, a six-coupled express locomotive with a four-cylinder, superheated compound engine, was one of the most elegant of its day and, since the reactivation of no.