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The connection of lines 8 and 10 of the Madrid metro between the Alonso Martínez and Nuevos Ministerios stations is part of a series of actions by the Community of Madrid and the Regional Transport Consortium to expand the Madrid metro network and interconnect the existing lines. The work was awarded to FCC Construcción, with work beginning in April 1996 and opening in January 1998. The project represents one of the largest and most important projects worldwide in which TBM-EPB type tunnel boring machines have been used.