Prussian state railways

For the most part the locomotives listed in the Prussian classification system were not built under state direction, but independently procured by the individual railway companies. In many cases they were only brought into the Prussian railway inventory when the ownership of their respective railway organisations was later transferred to the state authorities.

This explains their unusually high numbers with about 80 classes and variants, the overwhelming majority of which were constructed between 1877 and 1895. In 1889, Prussian standards were laid down in order that the number of classes could be reduced in the future.

The division of locomotives into class variants and different designs showed a clear predominance of tank engines. These were procured in widely varying, sometimes, large quantities totally some 9000 in all. That reflects a structure that largely consisted of unconnected branch lines (Kleinbahnen) for which no long-range locomotives – i.e. tender locomotives – had to be built. In terms of pure numbers, goods locomotives dominated, representing some 12,000 out of a total fleet of around 30,000 in Prussian state ownership.