Thornton viaduct is a disused railway viaduct crossing Pinch Beck valley at Thornton, near the city of Bradford in West Yorkshire, England. It is 300 yards (270 m) long and has 20 arches. It was built in an S-shape to allow a smooth access to Thornton station. The viaduct was part of the GNR's Queensbury Lines running between Queensbury and Keighley. It stopped carrying passengers in 1955 but remained open to goods until the 1960s. At that time, the railway closed and the tracks were pulled up.