The Musée des tramways à vapeur et des chemins de fer secondaires français (Museum of French steam tramways and secondary railways — MTVS) is located alongside Valmondois railway station, in the small town of Butry-sur-Oise in the departement of Val-d'Oise, 30 kilometres (19 mi) north of Paris.
The museum houses a collection of railway vehicles from the former French departmental railways, preserved, restored and rebuilt by the members of an association. During the season, short trips can be made on some of the exhibits, along a metre gauge (1,000 mm (3 ft 3 ⁄8 in)) line, one kilometre (0.62 miles) in length, nicknamed the "Impressionists' railway".