The Madridians call the three railway tunnels between the stations of Atocha and Chamartín with south-north direction through which more than 450 trains run daily with about 200. 000 travelers. The original was designed by Indalecio Prieto, Minister of Public Works of the Second Republic, in 1933. The right-wing press ridiculed the project he called the laughing tube when compared to a fair ground attraction at the time. Currently another works in its west wing that passes by Sol. The east wing is for the AVE (high speed) and is under construction.
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