 In 1859, a more direct line along Chantilly was opened.The Ermont-Eaubonne - Valmondois branch line via Saint-Leu-la-Forêt was opened in 1876.Between 1886 and 1949, a branch line existed from Valmondois to Marines

The line Pontoise - Creil was electrified in 1969, the line Ermont-Eaubonne - Valmondois in December 1970.