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The Hockley Railway Viaduct is a disused railway viaduct to the south of Winchester in Hampshire, England.
The viaduct, originally called the Twyford Viaduct, was built in the 1880s by the London and South Western Railway (LSWR). It provided a link over the River Itchen and water meadows, from the Didcot, Newbury and Southampton Railway (DNSR), to the LSWR's main line.
The viaduct was last used by the railway in the 1960s.
The structure has 33 spans. Although it appears to be a brick structure, the viaduct in fact has a solid concrete core in its pillars, with the bricks simply performing an aesthetic function. The bricks came from the Blanchards Works at Bishop's Waltham. It was long suspected that the viaduct's structure contained concrete, but not until recent borings into the structure were made was it realised that the majority of the bridge was made of the material. This makes it amongst the earliest modern structures to have a solid concrete core.