The railway maintains a collection of over 100 pieces of railway equipment, including steam locomotives and vintage railcars.
The line operates on a standard-gauge track that once connected the Meuse and Viroin river basins.
The Treignes museum is located at the former frontier station where the line once connected with the French railway network.
The museum collection includes the 'Le Belge', a replica of the first locomotive to run on the European mainland in 1835.
The association has been active in preserving Belgian railway heritage since 1973.
The Chemin de Fer à Vapeur des 3 Vallées (CFV3V) is a heritage railway operating steam and diesel locomotives along a scenic line between Mariembourg and Treignes in Belgium. The route travels through the Viroin valley, passing through villages including Nismes and Olloy-sur-Viroin. Its headquarters and main museum are located in a restored depot complex in Mariembourg. The fleet includes historic rolling stock preserved by a dedicated non-profit association of volunteers. The line is officially classified as a tourist railway, serving as a living museum of railway history. Passengers can experience travel in renovated carriages that date back to the early and mid-20th century.
The Treignes railway turntable, which allows for perfectly framed shots of locomotives turning 180 degrees.
Bring a jacket, as steam trains are often drafty and temperatures in vintage carriages can be cooler than outside.
Check the official website for 'Steam Festival' dates, as these are the only times specialized, rare engines are typically taken out for service.
Walk the entire length of the museum in Treignes to see the evolution of signals and station equipment.
Do not expect daily operation; the railway follows a specific seasonal schedule that limits services to certain days of the week.
Operates primarily on weekends and public holidays, with increased frequency during July and August; the museum is generally closed on Mondays outside of peak season.
Avoid walking near the tracks unless in designated areas; historical equipment is fragile and often lacks modern safety barriers.
