They were bought in 1896 for service on the Zabergäubahn (Lauffen-Leonbronn) und Federseebahn (Schussenried–Buchau–Riedlingen).

[1] From 1899, the first of the Tssd class appeared; they were a series of more modern mallet locomotives with a gauge of 750 mm (2 ft 5+1⁄2 in).

The K.W.St.E., however, it did not part with the Tss 3, because the Deutsche Reichsbahn, established in 1920, initially provided for the series numbers 99 501 to 99 504 for it.

The Tss 3 had a riveted plate metal outside frame that was stiffened with cast steel cross braces.

Due to their parallelogram-like arrangement, the coupling rods could adapt to the track curves.