 As a result of the lack of powerful express locomotives in the first decade of the 20th century, the Prussian state railways ordered the Class S 10 locomotives from Schwartzkopff.This engine was an evolutionary development of the passenger train locomotive, the Prussian P 8, which can be seen from the similarity in their locomotive frames.Unlike the P 8, however, the S 10—inspired by the Saxon XII H—had a four-cylinder engine with simple expansion.