The class 9932 was procured in 1932 for the “Molli” spa railway between Bad Doberan and Kühlungsborn with a gauge of 900 mm in order to cope with the increasing volume of traffic. The construction was based on the principles of standard locomotives in the relatively rare gauge of 900 mm. The locomotives are characterized by the fact that they are among the fastest narrow-gauge steam locomotives in Germany and the last of the four examples was only completed in 2009.
Like all standard locomotives, the 9932 was equipped with a superheated steam engine, while most narrow-gauge locomotives at that time still ran on saturated steam for the sake of simplicity. This increased efficiency and made the locomotive one of the most powerful on the narrow gauge. A difference to the standard locomotives was the plate frame instead of a bar frame. Since the area of operation was in the lowlands, the locomotives were designed for a speed of 50 km/h, even if the route only permitted 40 km/h. Even the class 9933 locomotives, which were only procured in GDR times, could not surpass their tractive effort and were even slower.
The three engines originally built by Orenstein & Koppel have survived the times and are still in regular use today. Even of their successors from the fifties, only one example is still in use today, which is also used more for special trips. From the 1990s, they were modernized in several stages, and today some of the originally riveted assemblies are available in a welded version. These include new boilers and frames.
In order to increase the capacity of the route, the construction of another locomotive according to the original plans was started in 2008 at the Meiningen steam locomotive works. It received all the improvements that its sisters have had over the years and was able to start operating in 2009 as the first newly built steam locomotive in Germany for 50 years.
Since the conversion to computer numbers from 1970 onwards, the locomotives have been given numbers that, strictly speaking, no longer belong to the 9932 series. They were originally numbered 99 321 to 99 323 and then became 99 2321 to 99 2323. The engine from Meiningen was eventually given 99 2324.