River Tay naturally. To aid this process and improve the health and resilience of the population a further 28 beavers will be released in Knapdale between 2017 and 2020, however there are no plans at present to release further beavers into the Tay. In the 19th century the Tay Rail Bridge was built across the firth at Dundee as part of the East Coast Main Line, which linked Aberdeen in the north with Edinburgh and London to the south. The bridge, designed by Sir Thomas Bouch, officially opened in May 1878. On 28 December 1879 the bridge collapsed as a train passed
Martyrs Bridge (Bamako) palace. From the south of the bridge runs Avenue de l'Unite Africain, the major route from the city centre south to Bamako-Senou Airport. In 1982 a second road bridge, the King Fahd Bridge, was opened just 500 meters upstream. Both bridges connect the central city neighborhood of Commune III with Badalabougou. Prior to the 1950s, the only crossing of the Niger at Bamako was at the Sotuba Causeway, 8 kilometers downstream from the city, which is a low water crossing of cut stone at the location of a natural rapids. The Aigrettes Dam, 200 kilometers upstream, is a hydroelectric station