Prussian T 11

The T 11 was designed to replace the obsolete and weak four-coupled locomotives in Berlin's suburban traffic. It was created together with the T 12 from the T 9³, but unlike its sister it was running on saturated steam to decrease construction costs.

The T 11 was clearly recognizable by the water tanks, which were pulled very far forward and were flush with the cylinders, which were pulled far back. A special feature was that the frame was used as a third water tank and thus extended the range in the demanding suburban service.

The distribution of the axles was chosen so that almost the same weight was on the driving wheels and the leading axle. While the first axle was only mounted in a Bissel frame in other 2-6-0 locomotives, a Krauss-Helmholtz bogie was used on the T 11 that connected the leading axle and the first driving axle to ensure better guidance curves.

Despite the simplicity of the saturated steam engine, the superheated T 12 was more economical in operation, which is why production of the T 11 was discontinued in 1910 after 470 locomotives in favor of the latter. The Reichsbahn took over 358 locomotives in 1925 and classified them as class 74^0-3. They were used in suburban traffic in Berlin and other major cities until these networks were electrified. After the Second World War, 65 units came to the Bundesbahn and 55 to the Reichsbahn, where most of the locomotives on both sides were retired by 1960 at the latest.