Tank wagons to transport various liquids appeared as soon as the railway itself. In Germany many different  designs were used since 19th century - unlike most of other wagons, these were not manufactured in large numbers in certain factories or on demand of the Deutsche Reichsbahn, but they were rather borrowed or rented by DR from private owners and companies. These wagons played one of the most important tasks during WWII, taking care of fuel supplies to the battlefield

 

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