Chemin de Fer à Vapeur des 3 Vallées — Mariembourg–Treignes
Chemin de Fer à Vapeur des 3 Vallées — Mariembourg–Treignes is a toddler-friendly scenic, steam and heritage train ride in Chaussée de Givet 49, 5660 Mariembourg, Belgium, Namur. The ride lasts Approximately 30 minutes each way on the published timetable; Mariembourg–Treignes 11:30–12:00 and return 13:10–13:40 for the displayed service pattern, costs €19 train-only adult / €25 train plus museum for adults and €13 ages 6–11 train-only / €17 train plus museum for children, and children under two ride Not stated on opened official page.
The official CFV3V pages identify a real tourist train between Mariembourg and Treignes, with named intermediate stops Nismes, Olloy-sur-Viroin and Vierves-sur-Viroin. The current 2026 timetable publishes adult and child fares, a 30-minute each-way service pattern, and a 2026 September calendar with upcoming 12–13 and 19–20 September departures at retrieval. The site is accessible to visitors with reduced mobility, but not all trains are accessible; stroller handling and fares for children under 6 were not published. Steam and diesel operation vary by service.