This article may be expanded with text translated from the corresponding article in Spanish. (May 2016) Click [show] for important translation instructions.
View a machine-translated version of the Spanish article.
Google's machine translation is a useful starting point for translations, but translators must revise errors as necessary and confirm that the translation is accurate, rather than simply copy-pasting machine-translated text into the English Wikipedia.
Do not translate text that appears unreliable or low-quality. If possible, verify the text with references provided in the foreign-language article.
The Guadarrama Tunnel is a railway tunnel across the Sierra de Guadarrama, along the high-speed route Madrid–Valladolid in Spain.
The tunnel has two tubes. The western tube is 28,407 m long and the eastern tube 28,418 m long, and it is the longest tunnel in Spain (when not counting the Line 12 tunnel in the Madrid Metro). The tunnel was opened for traffic in December 2007. The tunnel is used by the AVE high-speed trains.