Analysis of information sources in references of the Wikipedia article "Madrid Metro" in English language version.
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Metro de Madrid has in recent years implemented the most ambitious Expansion Programme in its entire history and the largest known worldwide, in four successive plans (1995–1999, 1999–2003, 2003–2007 and 2007–2011), taking on the rail integration tasks for the planning, design, construction, implementation and operation of a total of 172 new kilometres of network, 132 stations and 7 depots, and the design and commissioning of 795 new cars.