From 1898 the kkStB procured 99 locomotives of the class 106, which were a direct development of the class 6. They were almost identical in terms of their basic structure and most of the key figures. These were express locomotives with a 4-4-0 wheel arrangement with 2.14 meter wheels and a two-cylinder engine with compound action. Only the diameter of the low-pressure cylinder was 20 millimeters larger. The boiler now had a larger grate at the expense of the tubular heating surface.
The field of application of the 106 was the same as that of the 6, i.e. express trains up to about 250 tonnes on flat routes. As was usual in Austria at the time, the certification was only for 90 km/h, although 130 km/h had been reached on a test drive. On the flat they could reach 75 km/h with 200 tonnes and at one percent still 60 km/h with 60 tonnes.
The Southern Railway also procured 27 units of the class 106. One difference was that the safety valves were still designed as spring balance valves, while the State Railways were already using pop valves. After the First World War, the engines of the Southern Railway were divided between the Hungarian MÁV and the railways of the SHS Kingdom (the later JDŽ). Of the kkStB engines, 42 went to the BBÖ and 43 to the CSD. Others came to the PKP and one each to the FS and JDŽ. From 1938, the Deutsche Reichsbahn assigned the locomotives to the class 131, but retired them shortly thereafter. Its career at MÁV and CSD also ended shortly after the Second World War.