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Spiral viaduct
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Brusio spiral viaduct - a unique spiral viaduct railway near the town of Brus in Shveytsarii.
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Stone viaduct was opened on July 1, 1908, when he was put into operation railway section Tirano-Poschiavo company Bernina Railway. In 1943, the company bought the Rhaetian Railway, which still operates viaduk.
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The radius of the spiral viaduct is 70 meters with a length of 110 meters. The slope is 7%. Viaduct is made of stone and consists of nine arches, each a length of 10 meters. Train, downhill, passing on top of the viaduct, and then passes under it, making a complete krug.
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Source: mirfactov.com/