The Tay Bridge carries the main-line railway across the Firth of Tay in Scotland, between the city of Dundee and the suburb of Wormit in Fife. Its span is 2.75 miles .
From about 1854, there had been plans for a Tay crossing, to replace an early train-ferry. The first bridge, opened in 1878, was a single-track lattice design, notable for lightness and low cost. Its sudden collapse in a high wind on 28 December 1879 was one of the great engineering disasters of history, and its causes are still debated today.
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