For the local railway between Bielsko-Biała (Bielitz) and Kalwaria, the KFNB required tank locomotives with a maximum axle load of eight tonnes that could negotiate sharp curves while still attaining a top speed of 50 km/h. Two such locomotives were built by Wiener Neustadt in 1888 and were designated class IX.

They featured three coupled driving axles at the front and a two-axle bogie at the rear. Despite their relatively small driving wheels, which measured only 1,000 mm in diameter, they were capable of reaching the required speed. In service, however, it became apparent that when the water and coal supplies were depleted, the reduced weight on the bogie could cause instability and occasionally lead to derailments at higher speeds. As a result, their maximum operating speed was reduced to 35 km/h.

Following nationalisation, the two locomotives were classified as kkStB class 191. Around 1910, they were transferred to the line between Zaječí (Saitz), Čejč (Tscheitsch) and Hodonín (Göding). After World War I, when this line became part of Czechoslovakia, they were taken over by the ČSD and designated class 300.0. Both locomotives were withdrawn from service in 1929.