Class 13.^10-12 (pr. S 6), Tender loco of the DRG, these steam engines of type S4 were the first superheated steam engines bought by the Royal Prussian and the Grand Duchy of Hessian State Railways. The S4 was able to pull a train of 380 ton on flatlands with a speed of 95 km/h. The steam engine S4 was 30% more powerful than the S3. Until 1909 there are 104 locomotives S4 built by Borsig, Henschel and Humboldt.