After four prototypes in the year 1902, the Prussian State Railways purchased a total of 970 of these first superheated steam tank locomotives from 1905 to 1921. The class T 12 was designed for passenger traffic and was used in large numbers on the Berlin Metropolitan, Ring and Suburban Railroads.
Royal Prussian State Railroad Administration class T 12. Reverse unit. 3 axles powered. 2 traction tires. Coupler hook on front, RELEX coupler on rear. Length over buffers 13.5 cm (5-5/16").