The Great Northern and Great Eastern Joint Railway, colloquially referred to as "the Joint Line" was a railway line connecting Doncaster and Lincoln with March and Huntingdon in the eastern counties of England. It was owned jointly by the Great Northern Railway (GNR) and the Great Eastern Railway (GER). It was formed by transferring certain route sections from the parent companies, and by the construction of a new route between Spalding and Lincoln, and a number of short spurs and connections. It was controlled by a Joint Committee, and the owning companies operated their own trains with their own rolling stock. The Joint Line amounted to nearly 123 miles (198 km) of route.