Viaduc de Busseau-sur-Creuse, Railway bridge in Ahun, France.
Viaduc de Busseau-sur-Creuse is a 338.7-metre railway viaduct over the Creuse, with a metal deck 56.5 metres above the river. Five iron piers stand on granite masonry bases topped with two courses of Volvic basalt; the three central piers are 33.85 metres tall. The deck is a lattice girder 8 metres wide, originally double-track and now single-track.
Designed by engineers Marie Thirion, Wilhelm Nördling and Charles Geoffroy of the Compagnie d'Orléans, the viaduct was approved in March 1863 and built from January to December 1864 by a consortium including Basile Parent and the Établissements Jean-François Cail under Félix Moreaux. The first train crossed on 23 December 1864, and the line opened fully in February 1865. It was the first high bridge in France with both deck and piers of wrought and cast iron.
The structure received monument historique status on January 15, 1975, recognizing its importance in French railway engineering and architectural heritage.
The structure is viewable from several vantage points at ground level and along nearby paths that wind through the valley. Fair weather offers the clearest views of the stonework and metalwork details, while the bridge itself remains in continuous use by trains.
The design incorporates special steel anchor bars that protect against crosswinds and keep the bridge stable throughout the year. The deck rests on roller supports that allow it to shift slightly when heat and cold cause the metal components to expand and contract.
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