Mecklenburg T 4

In 1925 it was incorporated in the renumbering plan of the Deutsche Reichsbahn as DRG Class 91.19.

At the beginning of the 20th century much more powerful locomotives were needed for branch line operations, but the tried and trusted Prussian engines could not be used because the T 9 family was already clearly too heavy.

Of the 38 locomotives left after the Second World War, two were taken over by the PKP in Poland, four came into the hands of the Deutsche Bundesbahn (DB), 15 had to be given up as reparations and two were retired as a result of serious damage, leaving just 13 with the Deutsche Reichsbahn (DR) in East Germany, of which two in the early 1950s ran in Saxony (for example between Niederschlema and Schneeberg, because damage by the uranium mines meant that only very light vehicles could be employed; eventually even that was no longer possible).

The DB retired its locomotives by 1950 due to their low numbers, but continued to use them for a long time as industrial locos in repair shops.

In 1949, the DR took over four of the six locomotives built in 1919/1920 for private lines by Henschel and gave them the numbers 91 6401–6404.