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The Somerton Viaduct is a historic railway viaduct in the town of Somerton in Somerset, England. It is situated on the Langport and Castle Cary Railway, known as the Castle Cary Cut-off, on the Reading to Taunton Line. It carries the railway over the River Cary. The viaduct was opened in 1906. The construction was overseen by Great Western Railway engineer P.A. Anthony.