low-pressure cylinders had the same piston stroke. Although they were clearly intended for express services, these locomotives were not given a streamlined driver's cab. One of the locomotives, number 3634 (18 451) is preserved and is housed in the Deutsches Museum in Munich. A larger tender, the 2'2 T 32, was developed for series d and e. Series f There were only three locomotives in series f built in 1913. They were not significantly different from those of series a to c. Series g In 1914, 10 locomotives were built for the Palatinate (Pfalz) network. They differed from previous engines in several of their dimensions. For example, they were about 150 mm shorter, in order to fit on the 19 m turntables there. These locomotives were given the numbers 18 425 to 18 434 by the Deutsche Reichsbahn. One remained in the Soviet Zone of Occupation after the Second World War and did not return to the west until 1948, when it was exchanged for a Baden IV h, number 18 314. Series h and i During World War I, from 1914 to 1918, 35 more locomotives were produced. They were the last S 3/6 engines built for the Royal Bavarian State Railways. Deutsche Reichsbahn A total of 19 vehicles - including some brand new engines - had to be handed over to France and Belgium under the terms of the Armistice; the remainder went to the Deutsche Reichsbahn who gave them operating numbers 18 401 - 18 434, 18 441 - 18 458 and 18 461 - 18 478 in 1926. The S 3/6 became especially well known through its use as motive power for the Rheingold Express. Series k Because standard locomotives had still not been built, the Reichsbahn continued to produce the proven S 3/6. In 1923 and 1924 Maffei supplied the series k with a total of 30 engines. They were given operating numbers 18 479 to 18 508. They differed from the earlier series: technically, because of a somewhat larger superheater, and optically, with a driver's cab without a Windschneide, but whose side walls were angled in the area of the windows as on the later standard locomotives. Several were supplied to the Wiesbaden engine shed in order to haul the 'FD' long-distance express train, the Rheingold. Locomotive 18 505 is in the railway museum of the German Railway History Society (Deutsche Gesellschaft für Eisenbahngeschichte