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The International Union of Railways groups all special classes of railway goods wagon (less those in classes F, H, L, S or Z) into Class U in its goods wagon classification system. These are: * Bulk goods wagons for transporting powders, etc. * Dual coupling wagons for joining wagons with different coupling systems * Well wagons including Schnabel wagons * Self-discharging hoppers with loading hatches * Trials vehicles for RoadRailer and Kombirail systems for intermodal transport. Between 1964 and 1979 bulk goods wagons for liquid and gaseous materials (tank wagons) were included in Class U before being reclassified in 1980 as Class Z. == Bulk goods wagons for transporting powders (powder wagons) == The powder wagon is a special form of bulk goods wagon designed to transport goods in powder form. These wagons are pneumatically unloaded, usually by using compressed air. For goods that might react with oxygen in the compressed air, nitrogen is used instead. These wagons are used for bulk commodities, such as cement, that are so fine-grained they cannot be poured, or at least do not pour very well, and so cannot be emptied under gravity. Under the UIC system they are given the category letter U and index letter c. The do not normally have their own compressors but must be unloaded using external equipment. 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「Class U special wagon」の詳細全文を読む スポンサード リンク
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