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The DB railways Köf III class (after 1968 named classes 331,332,333 and 335) are light two axle shunting locomotives of Deutsche Bahn AG. ==History== The German national railways had already procured small locomotives of classes Kö I (up to ) and Köf II (up to for light shunting duties at small and medium-sized railway station. These locomotives were attached to their particular station and their use resulted in shortened travel times of mixed trains since the train locomotives did not need to complete all of the shunting work before the train could proceed to the next destination. After the Second World War the small locomotives of the Köf II class were in much demand and overused, but the use of a more powerful shunting locomotive such as the class V 60 was precluded, primarily for cost reasons: Small locomotives of the Köf type were cheaper to operate since the driver did not need to be a fully qualified locomotive driver. In the 1950s, in order to close the gap between the small locomotives (German:''Kleinlok'') and the V 60 the German Federal Railroad defined a new class of small locomotives - the Köf class III - as having a maximum power of ) and worked with the locomotive manufacturer Gmeinder to develop suitable locomotives. In 1959 8 prototypes were delivered and given the temporary class name Köf 10 (maximum speed 30 km/h) and Köf 11 (max. speed 45 km/h). 5 were of the Köf 11 type, the other 3 were Köf 10. The K in Köf indicates the locomotive is a small locomotive, the ö indicates diesel fuel (from the German for 'oil'), alternatives are b for petrol (German:''benzol''), d for steam (German:''Dampf'') meaning vapor, s indicates battery power. The third letter indicates the transmission type - f here indicates hydraulic transmission (German:''Flüssigkeitsgetriebe'' - "Fluid drive") - therefore the prefix Köf indicates a small locomotive with diesel engine and hydraulic power transmission. These 8 prototype models all differed in gearing and engine type for comparison purposes: this led to a standard locomotives with a Mannheim works engine of type RHS 518A with a nominal power of and hydraulic transmission of type L213U from Voith, drive to the wheels was by chain drive - these were given the classification name: Köf 11 With the introduction of the new numbering scheme in 1968 (see DB locomotive classification for more details) the 317 locomotives built to this specification (including the 5 Köf 11 prototypes) were given the class number 332, the 3 slower Köf 10 prototypes received class number 331 ;when the maximum speed was raised to 45 km/h by rebuilding in the 80s 331 001 and 002 were reclassified as type 332 and received the numbers 332 601 and 602 respectively from 1992 onwards. Experimental prototype locomotives Köf 11 numbers 001, 003, 004, 063 and 211 with other engine variations and gear variations received the numbers 332 701, 801, 702, 901 and 902 at the time of the reclassification. In 1965 Gmeinder introduced an advancement of the Köf 11 design in which the final drive of the power transmission had the chain drive replaced with drive shafts. These were given the classification Köf 12 (class 333 after 1968). 250 of this type were made. From 333 102 onwards the external appearance changed due to the installation of an improved cooler. To further lower personnel expenditure cost of shunting services in 1984 the German Railways began experimenting with radio controls for shunting locomotives. The reason for this is that previously shunting involved the work of two men: the small locomotive operator and a person who performed coupling tasks and monitored the shunting operations - the two communicating by radio. By giving one person remote control of the train the task could be performed by one person. The persons performing this were given the new job title ''Lokrangierführers'' in German. The engines 333 108, 114 and 138 were the first of the class to be fitted with the remote control equipment and from 1988 the rebuilding of locomotives of the class 333 began which were given the class number 335. Locomotives of the class 332 were not upgraded and from the middle of the 1990s onwards were phased out. Only classes 333 and 335 remain in service with the German Railways (Deutsche Bahn). 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「DB Class Köf III」の詳細全文を読む スポンサード リンク
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