It is a non-profit society that operates a railway from the town of Mariembourg, near Couvin to Treignes, near Viroinval.
The heritage railway connects with the greater Belgian rail network in Mariembourg.
The society has constructed its own platforms near the old locomotive roundhouse and water tower in Mariembourg, and in Treignes, a former border station, a museum with a large workshop has been built.
The last 3 kilometers from the line (partially established in France) are no longer usable, as its tunnel has been sold and turned in a mushroom growing plant.
Founded by former rail employees, the society purchased many steam engines from the largely nascent coal industry in its early years.