The T 9² was developed as an alternative to the T 9¹ freight locomotive due to concerns about the running characteristics of these 0-6-2T locomotives. So the carrying axle was moved to the front, leading to the 2-6-0T wheel arrangement. In most other respects like boiler, cylinders and driver diameter, they were fairly similar. Between 1892 and 1900, the Union Gießerei in Königberg (today Kaliningrad in Russia) built 235 locomotives of the type T 9².

In 1925, 111 locomotives from the Prussian State Railways became Reichsbahn class 91^0-1, with more coming from other operators. Some were now part of the Polish PKP and designated Tki2, of which 13 came back to the Reichsbahn in World War II. The West-German Bundesbahn used the class until 1953 and the East-German Reichsbahn until 1966. Today 91 134 is preserved in an operational state.