Engineering work is taking place in the Tottenham Hale area, closing all lines.
Early morning trains will be diverted via Seven Sisters, with journey times extended by several minutes as a result.
Stations on the Tottenham Hale line are only a short distance from those on the Seven Sisters line. You can view maps that show routes between these stations on the Greater Anglia website.
Check before you travel:
You can plan your journey using the National Rail Enquiries Journey Planner.