Oldenburg T 5.1

The Oldenburg Class T 5.1 was a German steam locomotive built for the Grand Duchy of Oldenburg State Railways as a tank engine for passenger train duties. Its design was based on that of the Prussian T 5.1.

Oldenburg T 5.1
DRG Class 71.4
Number(s)
  • GOE: 185–187, 207–208, 216–218, 226–228, 236, 256–258, 269–271, 279–280
  • DRG: 71 401 – 71 420
Quantity20
ManufacturerHanomag
Year(s) of manufacture1907–1921
Retired1930
Wheel arrangement2-4-2T
Axle arrangement1′B1′ n2t
Track gauge1,435 mm (4 ft 8 1⁄2 in)
Length over buffers11,685 mm (38 ft 4 in)
Overall wheelbase
  • 6,800 mm (22 ft 3 3⁄4 in)
  • 7,000 mm (22 ft 11 1⁄2 in)*
Empty weight41.50 t (40.84 long tons; 45.75 short tons)
Service weight53.10 t (52.26 long tons; 58.53 short tons)
Adhesive weight30.00 t (29.53 long tons; 33.07 short tons)
Axle load15.0 t (14.8 long tons; 16.5 short tons)
Top speed75 km/h (47 mph)
Driving wheel diameter1,600 mm (5 ft 3 in)
Leading wheel diameter1,000 mm (3 ft 3 3⁄8 in)
Trailing wheel diameter1,000 mm (3 ft 3 3⁄8 in)
No. of cylinders2
Cylinder bore430 mm (16 15⁄16 in)
Piston stroke600 mm (23 5⁄8 in)
Boiler Overpressure12 kgf/cm2 (1.18 MPa; 171 lbf/in2)
Grate area1.56 m2 (16.8 sq ft)
Evaporative heating area100.68 m2 (1,083.7 sq ft)
* from 1911

The firm of Hanomag manufactured 20 units of the Oldenburg T 5.1 between 1907 and 1921. Like its Prussian sisters it had the defect of poor riding qualities at high speeds. As a result, during the delivery of these engines design changes were made to the running gear, for example the overall wheelbase was increased. But even these measures met with no success.

The Deutsche Reichsbahn took over all 20 locomotives in 1925 as DRG Class 71.4 and gave them numbers 71 401 to 71 420. They were retired by 1930.

See also

Literature
  • Spielhoff, Lothar (1990). Länderbahn-Dampf-Lokomotiven. Band 1: Preußen, Mecklenburg, Oldenburg, Sachsen und Elsaß-Lothringen (in German). Stuttgart: Franckh'sche Verlagshandlung. ISBN 3-440-06145-0.
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