Strategic Route 5 - West Anglia was the designation given by Network Rail, from 2004 to 2009, to a grouping of railway lines in the East of England that encompassed the West Anglia Main Line and its various branch lines. The route provided key services to Cambridge and Stansted Airport as well as supporting suburban services in North London and rural services in Cambridgeshire, Norfolk and Suffolk.[1]
In 2010, Network Rail restructured its route categorisation. Routes 5 and 7 were merged into Strategic Route D: East Anglia.[2]