 A design of gauge locomotive was drawn up in 1923 by Chief Engineer Martens of the Munich-based Krauss and Company engineering company, based on a German 4-6-2 design, and 20 of these locomotives were built between 1925 and 1950.Three from the second batch were ordered for the Prater Liliputbahn, and two were delivered, and are still operating there today; the order for the third engine was cancelled.The railway was extended in 1933, almost doubling its length.