Prussian P 10

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The Prussian state railways' Class P 10 were 2-8-2 "Mikado" type passenger-hauling steam locomotives built for hauling heavy express trains in the hilly terrain of the Mittelgebirge. They were the last Prussian passenger train steam locomotives to be developed in Prussia before the state railways were merged into the Deutsche Reichsbahn (German Imperial Railway), who eventually designated them as DRG Class 39. The design by Borsig, under the supervision of chief engineer August Meister, was ready in 1919 but, due to material shortages, no locomotives were produced until 1922. They were three-cylinder locomotives, all cylinders driving the second coupled axle. Three sets of Walschaerts valve gear were used, the one for the inside cylinder being mainly located inside the frame, but driven from the same eccentric crank as the valve gear on the left-hand side; two eccentric rods of different lengths being attached to the same crank. The locomotives' heavy axle-load exceeded the 17 tonne standard specification of much of the German rail network, so they were limited to specific lines which were constructed to higher standards. A total of 260 of these locomotives were ultimately constructed and they worked primarily on the Main-Weser-Bahn between Frankfurt and Kassel, as well as the Eifel region, the Black Forest network until their replacement by Class 221 diesel locomotives, and the Gäubahn. They were the most powerful of all the state railway passenger locomotives. The vehicles were originally equipped with Prussian 2'2' T 31,5 tenders. The Deutsche Bundesbahn fitted many of the surviving examples with Witte smoke deflectors and 2'2' T 34 tenders. The last three engines were stabled in Stuttgart and taken out of service in 1967. 39 184 is displayed in a museum located on the grounds of Alstom Transport Deutschland in Salzgitter, Germany. The museum is not accessible to the...