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)DRG 71 401–420
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
Overall wheelbase6,800/7,000* mm
Empty weight41.50 t
Service weight53.10 t
Adhesive weight30.00 t
Axle load15.0 t
Top speed75 km/h
Driving wheel diameter1,600 mm
Leading wheel diameter1,000 mm
Trailing wheel diameter1,000 mm
No. of cylinders2
Cylinder bore430 mm
Piston stroke600
Boiler Overpressure12 bar
Grate area156 m2
Evaporative heating area100.68 m2
* 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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