was a class of German, eight-coupled, tender locomotives built for the Royal Saxon State Railways (Königlich Sächsische Staatseisenbahnen) for goods train duties.

The locomotive had a hollow, Klien-Lindner axle at the back and, initially, a long steam collection pipe above the centre of the boiler which was replaced on later models by two steam domes and a connecting pipe.

Twenty machines were delivered by the firm of Hartmann as wet steam engines, a further 30 with a Schmidt smoke tube superheater.

The Deutsche Reichsbahn took over 16 of the first series and gave them the running numbers 56 501–56 516.

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