Imperial-Royal State Railways and Austrian Southern Railway class 106

Starting in 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 design and most of the key figures. These were express locomotives with a 4-4-0 wheel arrangement with 2.14 metre wheels and a two-cylinder compound engine. Only the diameter of the low-pressure cylinder was 20 millimeters larger. The boiler now had a larger grate at the expense of the tube 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 lines on the level. As was usual in Austria at the time, the approved speed was only 90 km/h, although 130 km/h had been reached on a test run. On the level they could reach 75 km/h with 200 tonnes and at one percent still 60 km/h with 60 tonnes.

The Südbahn also procured 27 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 locomotives of the Südbahn were divided between the Hungarian MÁV and the railways of the SHS Kingdom (the later JDŽ). Of the kkStB locomotives, 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. Their career at MÁV and CSD also ended shortly after the Second World War.