page_title: Paris Métro Line 4
section_title: Southern Extension towards Bagneux
hierarchical_section_title: Paris Métro Line 4 / Future / Southern Extension towards Bagneux
caption_attribution_description: Français&#160;: Le quai direction Porte d'Orléans à la station de métro Mairie de Montrouge
context_page_description: Line 4 is one of the sixteen lines of the Paris Métro rapid transit system. Situated mostly within the boundaries of the City of Paris, it connects Porte de Clignancourt in the north and Mairie de Montrouge in the south, travelling across the heart of the city. Prior to 2013, when the southern terminus was changed from Porte d'Orléans to Mairie de Montrouge, the line was sometimes referred to as the Clignancourt – Orléans Line. At 12.1 km in length, it connects to all of the lines of the Métro apart from the 3bis and 7bis branch lines, as well as all of the RER express lines. Further, it is the second-busiest Métro line after Line 1, carrying over 154 million passengers in 2004.
  Line 4 was the first line to connect the Right and Left Banks of Paris via an underwater tunnel, built between 1905 and 1907. Line 4 long ran the oldest cars in service on the system, the MP 59, which used rubber tyres to dissipate the braking power through resistance. Those trains were withdrawn from service during the course of 2011 and 2012 after 45 years. They were replaced by the MP 89 CC stock from Line 1 when the latter line was automatised.
context_section_description: After the opening of Mairie de Montrouge, Line 4 will be extended further south by two stations: Barbara at the frontier between Montrouge and Bagneux (in Montrouge) and Bagneux - Lucie Aubrac. In October, 2011, the STIF announced that construction of the Bagneux extension will begin in 2014, with opening expected in 2019 . Barbara will also have a traditional two-track configuration, while Bagneux - Lucie Aubrac will have a three-track/dual platform configuration by which many terminating stations possess. Bagneux - Lucie Aubrac will also allow connection to the Red Line (now known as Line 15) of the Grand Paris Express network.
caption: Mairie de Montrouge
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