In line with the concept of German standardised locomotives set out in 1920, Borsig designed in 1930 three types of modern standard locomotives for the Kingdom of SHS, for express, local passenger and freight trains. The class 06 was intended for passenger trains and was especially adapted to meet the characteristics of mountain lines and poor quality coal. However, due to its weight, the bridges on the main lines had to be reinforced. The class 06 was used almost until steam locomotives were abandoned in the mid-1970’s. 06-018 was constructed in the Borsig Works, Berlin in 1930 and is still operational as part of the Museum train of the Slovenian Railways.