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Since 1956, the Swiss Federal Railways have been using two-axle wagons of a special design with an opening roof and gravity unloading to transport loose grain and groceries. Grain has always been a very important transport good. In addition to the actual grain, these products also include malt, rice, sugar, etc. For a long time, these were only transported in sacks in covered freight cars. For large quantities, this is a very cumbersome mode of transport. A suitable trolley was therefore developed that could be quickly loaded and unloaded with loose products. The first three prototype cars were supplied by the company Josef Meyer AG in Rheinfelden. After extensive testing, the optimized series was produced with an increased capacity of 42,000 liters. The two suppliers Josef Meyer AG and Ferriere Cattaneo, Giubiasco delivered a total of 380 cars from 1958 to 1962. 35 wagons of this series were later reserved for the transport of quartz sand. To avoid confusion with the grain wagons, the term "Quarzsand" is written in German and French on the side with the brake platform. Most of the transport of agricultural products in Switzerland is accounted for by domestic transport. In the first step, the domestic grain is transported from a collection point to an interim storage facility. From there it is transported to the processing companies. Exports of domestic grain are rare, which is why Swiss wagons are rarely found abroad. Sometimes some wagons of this type were rented or sold to industrial companies. These cars are or were used in some bright colors.