Formed in 1862 after the amalgamation of the Eastern Counties Railway and several other smaller railway companies the GER served Cambridge, Chelmsford, Colchester, Great Yarmouth, Ipswich, King's Lynn, Lowestoft, Norwich, Southend-on-Sea (opened by the GER in 1889), and East Anglian seaside resorts such as Hunstanton (whose prosperity was largely a result of the GER's line being built) and Cromer. It also served a suburban area, including Enfield, Chingford, Loughton and Ilford. This suburban network was, in the early 20th century, the busiest steam-hauled commuter system in the world.