In 1909 the Norwegian State Railways (NSB) invested in a new type of goods engine, primarily for the Randsfjord and Gjovik lines. The Class 24 was a development of the Classes 19 and 22, was built in several sub-classes: 24a (2-cylinder wet steam compound), 24b and 24c (2-cylinder superheated simple expansion) and 24d (also 2-cylinder simple expansion superheated). The Class 24b was built by Thune in 8 examples and was used by the NSB until the end of steam in 1969-70.
Despite their low speed limit of only 45 kph (28 mph), these engines were very popular and well functioning. They provided a good tractive effort going uphill even on lines which only permitted low axle loads |
