The GNR subsequently added a line eastwards to Sutton Bridge via Holbeach (the Norwich & Spalding Railway) in stages between 1858 and 1862, a westward route to Bourne in 1866 and another to the following year in an attempt to thwart the ambitions of the competing Great Eastern Railway (GER). These efforts did not succeed however and the company eventually agreed to work these routes jointly with the Midland Railway (the former pair forming the backbone of the Midland and Great Northern Joint Railway system) and the GER (March line) by the beginning of the 1870s. The collaboration between GNR and GER also led to the construction of the last route out of the town, the GE&GN Joint line to Sleaford which opened to traffic on 1 August 1882.