The locomotives 99 650 and 99 651 came to the Reichsbahndirektion Stuttgart at the end of 1928, which they allocated to Bw Aulendorf for use on the Ochsenhausen local railway.

Both locomotives were the main vehicles of the Württemberg narrow-gauge Biberach – Warthausen – Ochsenhausen [de] railway line until passenger traffic was discontinued on 31 May 1964.

Locomotives 99 643 and 99 647 came from Saxony to Austria in July 1944, the former immediately to the Waldviertler Schmalspurbahnen, at least 99 647 initially to the Vellachtalbahn in Carinthia.

From August 1944 both Saxon VI Ks are said to have been stationed in Gmünd (main depot of the Waldviertel narrow-gauge railways).

The locos of class 99.67–71 of the Deutsche Reichsbahn were additional copies of the Saxon VI K, which were built between 1923 and 1927.

In 1927 Maschinenfabrik Esslingen built four meter-gauge locomotives of this type, which were classified as class 99.19 on the Deutsche Reichsbahn.

The de facto newly built locomotives had new boilers, welded driver's cabs and storage tanks based on the model of the Einheitslokomotiven (standard locomotives), as well as new frames with a uniform axle-spacing of 1,000 mm (3 ft 3+3⁄8 in) – an increase form the previous value of 930 mm (3 ft 5⁄8 in).

In the new building, the drive was relocated from the fourth to the third coupled wheel set, which was mounted in the frame without lateral motion.

On 10 June 2016, it was brought from Steinheim an der Murr for sheltered storage at the Öchsle Museum Railway to Ochsenhausen.

99 713 was kept operational by the DR as a traditionslokomotive, 99 715 served as a spare parts donor and was officially a monument locomotive in front of the museum train in Radebeul Ost.

It was transferred to Oberwiesenthal in October 2015 after a long period of storage, received a general inspection there and has been operational again since July 2017.

In the summer of 2008, Öchsle-Bahn AG acquired the steam locomotive from the DB Museum in Nuremberg.

It has not been operational since December 2011 due to expired deadlines; work has been underway for a new general inspection since 2017.