Prussian S 6
| Prussian S 6 DRG Class 13.10–12, PKP Pd 5 (in photo) |
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Pd 5-17
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| Number(s) | DRG 13 1001–1286 |
| Quantity | 584 |
| Manufacturer |
Linke-Hofmann (330) Henschel (173), Humboldt (81) |
| Year(s) of manufacture | 1906–1913 |
| Retired | 1931 |
| Wheel arrangement | 4-4-0 |
| Axle arrangement | 2’B h2 |
| Type | 2 24.18 |
| Track gauge | 1,435 mm (4 ft 8 1⁄2 in) standard gauge |
| Length over buffers | 18,350 mm (60 ft 2.4 in) |
| Service weight | 60.6 t (59.6 long tons; 66.8 short tons) |
| Adhesive weight | 34.7 t (34.2 long tons; 38.3 short tons) |
| Axle load | 17.6 t (17.3 long tons; 19.4 short tons) |
| Top speed | 110 km/h (68 mph) |
| Indicated Power | 679 kW (911 hp) |
| Driving wheel diameter | 2,100 mm (82.68 in) |
| Leading wheel diameter | 1,000 mm (39.37 in) |
| No. of cylinders | 2 |
| Cylinder bore | 550 mm (21.65 in) |
| Piston stroke | 630 mm (24.80 in) |
| Boiler Overpressure | 12 bar (1,200 kPa; 170 psi) |
| Grate area | 2.35 m2 (25.3 sq ft) |
| Superheater area | 40.32 m2 (434.0 sq ft) |
| Evaporative heating area | 136.98 m2 (1,474.4 sq ft) |
| Tender | pr 2’2’ T 21.5 |
| Water capacity | 21.5 m3 (4,700 imp gal; 5,700 US gal) |
The Prussian S 6 (later DRG Class 13.10–12) was a class of German steam locomotive with a 4-4-0 wheel arrangement operated by the Prussian state railways for express train services.
After the Prussian steam locomotive classes S 4 and S 5 proved less than fully satisfactory, there was a requirement in Prussia for faster and more powerful express locomotives. To that end the Head of the Locomotive Design and Procurement Department, Robert Garbe, proposed to the Locomotive Committee in 1904 a design by Linke-Hofmann of Breslau for a 4-4-0 superheated, express train locomotive. This was an evolutionary development of the Prussian Class S 4 that also had a 4-4-0 configuration. In putting this forward, Garbe was especially keen to prove the superiority of his design compared with the four-cylinder, wet steam, compound locomotives, particularly its predecessor, the Prussian Class S 7.
In 1905/1906 Garbe pushed through the construction of the S 6. Between 1906 and 1913 a total of 584 units were manufactured by Linke-Hofmann, Henschel-Werke and the Maschinenbauanstalt Humboldt in Cologne. They were the last four-coupled, express locomotives to be built in Germany and, for a long time, were the most economical locomotives in the Prussian state railways.
The design initially caused major difficulties, because it had to keep to the maximum permitted axle load for the railway network of 16 t (15.7 long tons; 17.6 short tons).
This limitation led to the weight savings in many areas. At first, the plate frame was made of 22 mm (0.87 in) thick material; this later had to be changed to the usual 25 mm (0.98 in). On the first few engines, a smokebox superheater was installed, but the design this was changed during the first year in favour of a Schmidt smoke tube superheater. The long boiler was located well forward in order to spread the weight to the front carrying wheels and to keep the axle load within the maximum limits, thus giving the engine the typical appearance of a "Garbe locomotive".
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