Prussian S 10 - Trial Locomotives

Trial Locomotives

Three S 10.2s were fitted with Stumpf parallel-flow cylinders (Gleichstromzylinder) for test purposes, whereby unlike the production models, the outer cylinders drove the second coupled axle. Even when they were converted to the standard configuration, the twin-axle drive was retained. One of these engines went to Poland after the First World War; the others were given numbers 17 203 and 17 204 by the Deutsche Reichsbahn.

In 1925, locomotive 17 206 was given a Schmidt-Hartmann high-pressure boiler with a boiler overpressure of 5.884 MPa (58.84 bar), and the drive was converted to a compound configuration. The increased performance of the H 17 206 designated locomotive compared with the production design did not justify the higher construction costs however; the engine was converted back to the standard design in 1929 and retired in 1936.

The two locomotives with running numbers 17 236 and 17 239 were given a medium-pressure boiler in 1933 with a boiler overpressure of 2.452 MPa (24.52 bar), and they were also converted to compound operation at the same time. The performance of these converted engines matched that of the DRG Class 03 and they were employed together with the Class 03s in scheduled services. After several cases of boiler damage, however the boiler pressure, had to be reduced to 16 bar (1.6 MPa) in order to avoid further problems. During the 1930s the two medium-pressure locomotives were reconverted again. Both engines survived the ware and were retired together with the other S 10.2s in 1948.