West Anglia Great Northern, commonly shortened to WAGN, was a train operating company in England. It operated the West Anglia Great Northern franchise between January 1997 and March 2004, as well as the Great Northern franchise between April 2004 and March 2006. It was initially owned by Prism Rail, and was subsequently acquired by the British transport conglomerate National Express.

The Great Northern route, formerly known as Great Northern Electrics, is the name given to suburban rail services run on the southern end of Britain's East Coast Main Line and its associated branches. Services operate to or from London King's Cross and London Moorgate. Destinations include Hertford North, Welwyn Garden City, Stevenage, and Cambridge, and in peak hours, additional services run to Peterborough and King's Lynn. Services run through parts of Greater London, Hertfordshire, Bedfordshire, Cambridgeshire, and Norfolk.