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.

During the season, short trips can be made on some of the exhibits, at a separate location in the town of Crèvecoeur le Grand, along a metre gauge (1,000 mm (3 ft 3+3⁄8 in)) line, three kilometers (1.86 miles) in length, nicknamed the "Impressionists' railway".

It was once planned for the museum to be moved further northwest to the Vexin region, where it would have had larger storage space and a longer railway line to use for its train journeys, but the project was abandoned in March 2009.

Since 2013, a project is under way to transfer the museum to Crèvecœur-le-Grand, called the "Train à Vapeur du Beauvaisis", which is now the association's main activity center.

The new line, built on an abandoned SNCF right of way, operates since 2019 between the main station at Crèvecœur-le-Grand and a small halt of Rotangy, a distance of 3.5 km (2.2 mi).