The Oldenburg Class P 4.2 were German steam locomotives 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, with 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 locomotives were procured up to 1909.
The locomotives taken over by the Deutsche Reichsbahn were grouped as DRG Class 36.12 and were 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
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