The Apennine Base Tunnel is a railway base tunnel 18.507 km long on the Bologna-Florence Direttissima line in central Italy. The tunnel was opened on 21 April 1934 shortening the rail connection by 35 km compared to the old Porrettana railway over the mountain range. At the time, it was the world's second longest tunnel after the Simplon Tunnel, and the longest built with double track; today it is the 16th longest in the world.
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Coordinates 44°7'45.417" N 11°10'17.873" E
