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.

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Oldenburg P 4.2 DRG Class 36.12
Locomotive 190 Neptun (Hanomag 5410 of 1909)
Type and origin Builder Hanomag Build date 1907–1909 Total produced 8
Specifications Configuration: ​  • Whyte 4-4-0 Gauge 1,435 mm (4 ft 8+1⁄2 in) Leading dia. 1,000 mm (39+3⁄8 in) Driver dia. 1,750 mm (68+7⁄8 in) Length: ​  • Over beams 17,461 mm (57 ft 3+1⁄2 in) Axle load 15.1 t (14.9 long tons; 16.6 short tons) Adhesive weight 30.2 t (29.7 long tons; 33.3 short tons) Service weight 52.2 t (51.4 long tons; 57.5 short tons) Water cap. 16.0 m3 (3,500 imp gal; 4,200 US gal) Heating surface:  • Firebox 2.27 m2 (24.4 sq ft)  • Evaporative 119.35 m2 (1,284.7 sq ft) Cylinders 2 Piston stroke 600 mm (23+5⁄8 in) High-pressure cylinder 460 mm (18+1⁄8 in) Low-pressure cylinder 680 mm (26+3⁄4 in)
Performance figures Maximum speed 90 km/h (56 mph) Indicated power 427 kW (581 PS; 573 hp)
Career Numbers GOE: 174–178, 188–190 DRG: 36 1251 - 36 1258 Retired 1929

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

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

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.^{[page needed]}
• Weisbrod, Manfred; Müller, Hans; Petznik, Wolfgang (1976). Dampflokomotiven deutscher Eisenbahnen, Baureihe 01–39 (EFA 1.1) (in German) (3rd ed.). Düsseldorf: Alba Buchverlag. pp. 203–205. ISBN 3-87094-081-6.

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[de] Oldenburgische P 4.2