Porte de Clignancourt is a station of the Paris Métro, the northern terminus of line 4, situated in the 18th Arrondissement. The station was opened on 21 April 1908 as part of the first section of the line from Châtelet. A terminal loop is provided at the station for trains to turn around to return south towards Porte d'Orleans. Passengers usually detrain at the arrival platform and then the train proceeds empty via the loop to the departure platform.