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The model in true to the original lettering and livery carries acid transport tanks. Coupler pocket according to NEM 362 standards with close coupler motion link. The vehicle features a brakeman's cab. The 2-axle acid tank wagons had usually 12 ceramic pots, which served for the transport of corrosive liquids. Prototype: Theodor Rudolph August Koepp was a chemist, entrepreneur and member of the German Reichstag. He devoted himself to the chemical industry and founded in 1859, the company "Rudolph Koepp & Co. Chemische Werke" in Oestrich, which was the first company in Germany that produced oxalic acid and formic acid industrially.