Although Baden, Bavaria and Prussia had tested Mallet tender locomotives for winding lines only with limited success, the Saxon State Railways ordered 30 Mallets from Hartmann which were built between 1898 and 1903. They had a Belpaire firebox and two groups of two driving axles each. Here the results were the same and the locomotives tended to slip.
In the end, the solution for heavy freight traffic was the IX V with the 2-8-0 wheel arrangement where the last driving axle was a flexible Klien-Lindner axle. After World War I, seven I V had to be passed to France. Only 13 were left in Germany and were the only Mallet tender locomotives which made it into the Reichsbahn's renumbering plan. There they became 55 6001 to 55 6013 and were withdrawn by 1927.