Gare du Nord () is a station on Line 4 and Line 5 of the Paris Métro. It is the busiest station in the system (not including RER stations), with 48 million entrances a year. It is connected to the SNCF railway station Gare du Nord (literally, "North Station", until 1938 run by the well-known company Chemins de Fer du Nord), which is served by RER B, RER D and Transilien Nord commuter trains as well as interurban trains to northern France, Eurostar trains to London and Thalys trains to Brussels, Amsterdam and Cologne. The station is also connected to the La Chapelle Métro station on Line 2 and to the Magenta RER station on RER E. History 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. On 5 October 1942, the old Line 5 station was closed and replaced with a through station on 12 October 1942, in preparation for the extension to Église de Pantin. The part of the old loop that was not destroyed during the building of RER B in the 1970s, together with connecting lines to Line 2 and Line 4 under the Boulevard de Magenta and Rue de Dunkerque, are now used for driver training (USFRT). The length of platforms on Line 4 were extended from 75 to 90 metres in the 1960s during the upgrading of the line for rubber-tyre operations. On 10 December 1981, the RER B station at Gare du Nord opened. The RER D station opened on 27 September 1987 with the rest of the line, while Gare de Magenta on the RER E line opened on 14 July 1999. The Church of Saint-Vincent-de-Paul is located nearby. Passenger services Access Access to the station, designed in 1900 by the architect Hector Guimard of the Compagnie Générale du Métropolitain de Paris, has been listed as a historic monument since 29 May 1978. It has four entrances: Entrance: 9, Boulevard de Denain; Entrance: 17, Rue de Dunkerque; Entrance: 18, Rue de Dunkerque; Entrance: SNCF station. Station layout Platforms The stations of the two lines are of a standard configuration: they include two platforms flanking two tracks under an elliptical vault. However, the Line 4