Oldenburg P 4.2

The Oldenburg Class P 4.2 steam locomotives were German engines built for the Grand Duchy of Oldenburg State Railways (Großherzoglich Oldenburgische Staatseisenbahnen) between 1907 and 1909. They were based on the standard variant of the Prussian P 4.2, but there were a number of small differences such as a Ranafier steam dryer and, on three examples, a Lentz valve gear, a system widely used in Oldenburg. Production began in 1907 and eight engines were procured up to 1909.

Oldenburg P 4.2
DRG Class 36.12
Locomotive Neptun
Number(s)DRG 36 1251 - 1258
Quantity8
ManufacturerHanomag
Year(s) of manufacture1907 - 1909
Retired1929
Wheel arrangement4-4-0
Axle arrangement2'B n2v
Track gauge1,435 mm (4 ft 8 1⁄2 in)
Length over buffers17,461 mm (57 ft 3 in)
Service weight52.2 t
Adhesive weight30.2 t
Axle load15.1 t
Top speed90 km/h (56 mph)
Indicated Power427 kW
Driving wheel diameter1,750 mm (69 in)
Leading wheel diameter1,000 mm (39 in)
No. of cylinders2
Cylinder bore460 mm (18 in)/680 mm (27 in)
Piston stroke600 mm (24 in)
Grate area2.27 m2
Evaporative heating area119.35 m2
Tenderpr 3 T 12 and 2'2' T 20
Water capacity16.0 m3

The engines taken over by the Deutsche Reichsbahn were grouped as DRG Class 36.12 given numbers 36 1251 to 36 1258.

The locomotives used tenders of the 3 T 12 or 2'2' T 20 classes.

See also

Sources
    • 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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