Line 150 is being built by the Belgian State Railways to link the lower Sambre to the French Ardennes: two industrial basins connected by waterway but for which the rail represents a significant acceleration.
The Ermeton-sur-Biert - Anhée section (at the gates of Dinant) is also called "Ligne de la Molignée", from the name of the river whose valley it follows. The line has a second section between Jemelle and Dinant. This second section - also called "Line of the Lesse" - is also referenced under line number 152 at the time of the Belgian State company. If the two sections have the same name, it is because initially it was a single line, integrating the Dinant - Houyet junction. The development of the two sections will however be relatively independent. Since the closure of the Jemelle - Houyet section, the remaining section (Houyet - Dinant) has been administratively integrated into line 166.