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The Somport Railway Tunnel is a historic railway tunnel linking France and Spain through the Pyrenees. Built in the early 20th century, it was opened in 1928 as part of the Pau–Canfranc railway line, providing a direct rail connection between the two countries. At approximately 7.9 kilometres long, it was one of the longest railway tunnels in Europe at the time. The international railway service was interrupted in 1970 after a train accident destroyed a bridge on the French side. Since then, the tunnel has remained closed to railway traffic, while the Canfranc station on the Spanish side has become an important historical and tourist site.