Late night engineering work.
From 2315 Monday to Thursday nights, Infrastructure Maintenance work is taking place between Tottenham Hale and Cheshunt. West Anglia and Stansted Express services will be diverted via Seven Sisters.
On Tuesday to Friday mornings the 0440 London Liverpool Street to Stansted Airport will call at Seven Sisters in place of Tottenham Hale.
Details can be found in the attached timetable....