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| map = }} Line 4 ((:liɲᵊ katʁᵊ)) 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 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 also utilized the oldest cars in service on the system, the MP 59, which uses rubber tyres to dissipate the energy of braking power through resistance. The trains were withdrawn from service during the course of 2011 and 2012 after 45 years (with some being in service for 50 years). They were replaced by the MP 89 CC stock from Line 1. ''(From :fr:Ligne 4 du métro de Paris)''. For the first time since the line's initial construction, Line 4 was extended into the southern suburbs of Montrouge, serving the new southern terminus of Mairie de Montrouge. Construction of the extension began in 2008 and it opened to passengers on March 23, 2013 () (). ==History== 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Paris Métro Line 4」の詳細全文を読む スポンサード リンク
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