During the 19C, the Port de la Creusille was reserved for heavy, cumbersome materials such as stone and wood. It was also used to unload sand extracted from the Loire and intended for use on construction sites. However, the majority of river traffic, such as wine, wheat and salt, was handled on the opposite bank of the river. In the 19C, the invention of a forerunner of the steam engine by an engineer from Blois, Denis Papin (1647-1712), was to revolutionise the life of the river. Boats known as “inexplosibles” sailed up and down the Loire until the arrival of the railway line, which gradually led to the decline of river traffic. For many years, the chocolate manufacturer, Auguste Poulain, used the Loire to transport cocoa beans and his company’s bars of chocolate.