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node interchange Puerta del Sol is an underground station located in the central district of Madrid.
E 'consists of: *
railway station serving the Cercanías lines C3 and C4;
* Underground stations serving the three lines L1, L2 and L3.
The railway station is the gallery of travel and access through the atrium where you can trade with lines 1, 2 and 3 of the subway in the future will also be possible to line 5 through to a new connection to the metro station Gran Via.
The gallery was built to run using the "German" and today is the world's largest underground excavation. Size 207 meters long, 20 wide and 15 high. It has two internal platforms: the lower with the tracks and platforms and the intermediate connection with the mezzanine lobby.
The train station is part of the Túnel de la laughter, about 8 km long, which connects north-south underground railway stations of Atocha and Chamartin. The gallery Cercanías lines (regional) comes with one pre-existing inaugurated in 1967, also in the Iberian gauge (1,668 mm), private lines Renfe (national). E 'in a third tunnel project, standard gauge (1,435 mm), given at high speed.
The stages of development of the node were as follows:
* 1919: opening of a railway line,
* 1924: opening of the station line 2
* 1936: opening of the railway line 3
* June 28, 2009: opening of the railway station.
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