WAGN Railway used the Class 317 fleet on various services, including all London Liverpool Street to Cambridge services on the "West Anglia" route, and many stopping services to intermediate destinations. The fleet also worked services on the "Great Northern" route, from London King's Cross to Cambridge, Peterborough, Hertford, Stevenage and King's Lynn, plus at weekends when the line to Moorgate was closed, the units operated inner suburban services from London King's Cross to Letchworth Garden City, Hertford and Welwyn Garden City.