Hannöversche Südbahn
Initially there were only two pairs of trains a day on the line. From 1 August 1848, there were three pairs of trains a day for two years. The journey between Hümme and Karlshafen took between 35 and 40 minutes. In 1851 the Kingdom of Hanover joined the German Customs Union, so the port of Hann. Münden, which was closer to Kassel, came to be preferred for river transport. In parallel, river traffic on the upper Weser, which was strongly affected by changes in water levels, was significantly impacted by the opening of the Hanoverian Southern Railway in 1856 from Göttingen via Hann. Münden to Kassel. The cargo handled at the Weser quay in Karlshafen in 1863 was only 19,024 tonnes.