West Anglia: services operate from Liverpool Street and run to Enfield, Hertford East, Stansted Airport and Cambridge.
Great Northern: services operate from Kings Cross (Outer Suburban) and Moorgate (Inner Suburban).
Outer Suburban: services run to Peterborough, Cambridge and Kings Lynn.
Inner Suburban: trains run to Welwyn Garden City and Hertford North (some are extended to Letchworth).
WAGN was originally owned by Prism Rail which was subsequently absorbed by National Express Group.