The Tay Bridge carries rail traffic across the Firth of Tay in Scotland between Dundee and the suburb of Wormit in Fife. Its span is 2+3⁄4 miles. It is the second bridge to occupy the site. From Wikipedia
The 2.1-mile Colne Valley Viaduct will support high-speed trains as part of the HS2 project, linking London and Birmingham.