Railway Stell West is a Site of Special Scientific Interest in the Sedgefield district of County Durham, England. The site consists of a length of ditch alongside the East Coast Main Line railway, 3 km east of the town of Newton Aycliffe. The site lies at the centre of what was formerly an extensive area of wetland, known as Bradbury, Mordon and Preston Carrs, of which the ditch alongside the railway is the only surviving remnant. A variety of wetland habitats occur, ranging from open water to tall herb communities.