Oldenburg S 10

The express train locomotives of Oldenburg Class S 10 were built for the Grand Duchy of Oldenburg State Railways for duties on the Bremen–Oldenburg–Wilhelmshaven line, which was the most important express route in Oldenburg. They were amongst the few locomotives of this railway company that were not based on those of the Prussian state railways, because the light railway track dictated that they had to have an average axle load of no more than 15 t which was lower than that on comparable Prussian vehicles.

Oldenburg S 10 DRG Class 16
Number(s)	GOE: 266 Berlin, 267 München, 268 Dresden DRG 16 001–003
Quantity	3
Manufacturer	Hanomag
Year(s) of manufacture	1917
Retired	1926
Wheel arrangement	2-6-2
Axle arrangement	1′C1′ h2
Type	S 35.15
Length over buffers	20,650 mm (67 ft 9 in) (incl. tender)
Service weight	73.9 t (72.7 long tons; 81.5 short tons)
Adhesive weight	45.4 t (44.7 long tons; 50.0 short tons)
Axle load	15.1 tonnes (14.9 long tons; 16.6 short tons)
Top speed	100 km/h (62 mph)
Indicated Power	1,130 PS (831 kW; 1,110 hp)
Driving wheel diameter	1,980 mm (78 in)
Leading wheel diameter	1,100 mm (43 ^1⁄4 in)
Trailing wheel diameter	1,100 mm (43 ^1⁄4 in)
Cylinder bore	580 mm (22 ^13⁄16 in)
Piston stroke	630 mm (24 ^13⁄16 in)
Boiler Overpressure	14 kgf/cm^2 (1.37 MPa; 199 lbf/in^2)
Grate area	3.00 m^2 (32.3 sq ft)
Superheater area	41.20 m^2 (443.5 sq ft)
Evaporative heating area	145.88 m^2 (1,570.2 sq ft)

The three vehicles of this class were built by Hanomag from 1917 and had a 2-6-2 (Prairie) wheel arrangement which was rare for Germany. They had Lentz valve gear which was typical of Oldenburg. The engines had an uneven distribution of load, however, as well as poor riding qualities and were often bedevilled with boiler problems. In addition, an incorrect matching of the radiative and tube heating areas led to leaks in sides of the tubes.

The three S 10 engines were grouped by the Deutsche Reichsbahn into Class 16 with operating numbers 16 001–16 003. They were the only express train locomotives with a 2-6-2 wheel arrangement and therefore had their own class. After the lines were upgraded to 17 tonnes axle load, the temperamental S 10s were retired by 1926 and replaced by Prussian P 8s that had been employed in Oldenburg since 1921.

The locomotives were coupled with Oldenburg class 2'2' T 20 tenders.

See also

• Grand Duchy of Oldenburg State Railways
• List of Oldenburg locomotives and railbuses
• Länderbahnen

References

• Löffler, Peter (2002). "Die unglückliche S 10. Die oldenburgische S 10/Baureihe 16.0". Lok Magazin. München: GeraNova Zeitschriftenverlag GmbH. 41 (250): 36–45. ISSN 0458-1822.