Gare du Nord
On 15 November 1907, Line 5 was extended from Gare d'Orléans (now known as Gare d'Austerlitz) to Gare du Nord where the station was built on a reversing loop. On 21 April 1908, Line 4 was opened from Châtelet to Porte de Clignancourt through Gare du Nord.