Oldenburg G 7 DRG Class 55.62
An ex-Prussian G 7.1, no. 55 669, in Potsdam on 17 May 1993
Type and origin Build date 1912–1918 Total produced 22
Specifications Configuration: ​  • Whyte 0-8-0 Driver dia. 1,350 mm (4 ft 5 in) Adhesive weight 58.6 t (57.7 long tons; 64.6 short tons) Service weight 58.6 t (57.7 long tons; 64.6 short tons) Boiler pressure 12 kgf/cm2 (1.18 MPa; 171 lbf/in2) Heating surface: ​  • Firebox 2.23 m2 (24.0 sq ft)  • Evaporative 180.10 m2 (1,938.6 sq ft) Cylinders 2, compound High-pressure cylinder 500 mm (19+11⁄16 in) Low-pressure cylinder 750 mm (29+1⁄2 in) Piston stroke 660 mm (26 in)
Performance figures Maximum speed 45 km/h (28 mph)
Career Numbers GOE: 231–235, 246–247, 251–255, 259–263, 272–276 DRG: 55 6201–6213

The Oldenburg G 7 steam locomotive was a class of German 0-8-0 locomotives produced for the Grand Duchy of Oldenburg State Railways (Großherzoglich Oldenburgische Eisenbahn). It was an eight-coupled engine, intended for heavy goods train duties, and was based on the Prussian G 7. It had a 1,660 mm diameter boiler located 2,820 mm above the top of the rails in the plate frame, and was equipped with a single Walschaerts valve gear as well as a Lentz valve gear. Thirteen were taken over by the Deutsche Reichsbahn, grouped into DRG Class 55.62 and given numbers 55 6201–55 6213.

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

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• Vandenberghen, J. (1989). La guerre 1914 - 1918 et les locomotives "Armistice", 3. Description des locomotives bavaroises, saxonnes, badoises, mecklebourgeoises, oldenbourgeoises (PDF) (in French). Brussels: SNCB. p. 59.
• Weisbrod, Manfred; Müller, Hans; Petznik, Wolfgang (1978). Dampflokomotiven deutscher Eisenbahnen, Baureihe 41–59 (EFA 1.2) (in German) (3rd ed.). Düsseldorf: Alba. pp. 130–132. ISBN 3-87094-082-4.