 The first series of 13 locomotives was built by the "Sächsische Maschinenfabrik", previously Richard Hartmann, in Chemnitz.According to the supply agreement, the "Sächsische Maschinenfabrik" was supposed to deliver more locos, but as a result of its bankruptcy and liquidation in 1930, this order was transferred to the "Berliner Maschinenbau AG" ("BMAG"), previously "Schwartzkopff".In 1928, seven locomotives were supplied by "BMAG" and another twelve followed in 1933.