In 1612, technical innovations were implemented in Sassendorf, including the construction of the Gradierwerk. The increased production output led to increased wood consumption as fuel for the salt works. This led to a switch to coal firing in 1705. However, the transportation of this material proved to be costly. A significant improvement was the railroad line built in 1850, which established a west-east connection between the Cologne-Minden and Thuringian railroads. This connection of the 'Hellweg' trade route to the German railroad network enabled the essential modernization of the salt works.