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Viaduct (San Esteban-Barca d'Alva Source)
One of the most complex engineering projects of the 19th century, the Duero railway, is home to a spectacular viaduct over the river Froya. The municipal infrastructure in Hinojosa de Duero is currently in a state of disrepair, which detracts from its intrinsic value. Despite this, the metal and wood skeleton remains an interesting attraction in these picturesque valleys of the Arribes del Duero.
The project in which the viaduct is framed is the construction of a railway section that would connect Portugal and Spain by crossing the Duero river at La Fregeneda. The project was completed between 1883 and 1887. It involved the construction of bridges, tunnels and other infrastructure to enable the railway to cross the Duero gorges and mountains. Consequently, one of the most distinctive railway layouts in Europe was established. Despite this, the track ceased operations in 1985 due to low economic profitability. This was not the end of the matter, as in 1998 the road was designated an Asset of Cultural Interest, with part of it becoming the Camino de Hierro greenway.
The Froya viaduct's design reflects the cutting-edge of 19th-century architecture and engineering, showcasing a striking use of iron architecture. The bridge is comprised of four spans, with a total length of 165 metres, making it the second longest bridge on the route after the International Bridge. The structure has a length of between 37 and 45 metres and features an iron and wooden grill board, which, regrettably, displays the effects of time. It is also worth noting that the entire infrastructure is supported by three vertiginous pillars constructed from local granite masonry.