The 44 engines of this class built by the Maschinenfabrik Esslingen between 1917 and 1924 were intended for work on the Geislingen ramp (Geislinger Steige) and the Baden Black Forest line.
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Adolph Giesl-Gieslingen: Lokomotiv-Athleten, Geschichte, Leistung und Kurvenlauf der Sechs- und Siebenkuppler, Verlag Slezak, Wien 1995, ISBN 3-85416-171-9.
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