 A total of 159 units were manufactured, more than all the other state railway Pacifics taken together.89 of these locomotives (Series a to i) were built for the Royal Bavarian State Railways and 70 (Series k to o) for the Deutsche Reichsbahn.The S 3/6, designed by the Maffei company under the leadership of engineers Anton Hammel und Heinrich Leppla, was a development of the first German Pacific, the somewhat smaller Baden IV f. Like its forerunner, the S 3/6 had a four-cylinder compound running gear with single-axle drive on the second coupled axle.