The Grand Duchy of Oldenburg gained an important link to the south in 1876 with the so-called Southern Railway from Oldenburg via Quakenbrück as far as Eversburg on the Osnabrück–Rheine line.
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The Oldenburg staff were transferred to the Reichsbahn divisions of Hannover, Hamburg und Münster/Westfalia after the disbandment of the railway division in Oldenburg town.
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On 17 November 1866, the first section of the route Oldenburg–Delmenhorst was opened; in July 1867 its extension to Bremen followed, and in September of the same year the section from Oldenburg to Heppens was finally completed.
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The express train locomotives of Oldenburg Class S 10 were built for the Grand Duchy of Oldenburg State Railways for duties on the Bremen–Oldenburg–Wilhelmshaven line, which was the most important express route in Oldenburg.