Apart from the letter M, which changes, the acronym CFV3V stands for Chemin de Fer à Vapeur des 3 Vallées, the association that operates railroad line 132 between Mariembourg and Treignes, in other words, steam and diesel trains.
The acronym MCFV3V stands for Musée du Chemin de Fer à Vapeur des 3 Vallées. The museum’s management association looks after the museum and the exhibition of locomotives, carriages, vans and other railway and industrial equipment on display at Treignes.
The 2 associations are quite distinct from each other, even if on a day-to-day basis they collaborate and work together to safeguard our railway heritage.