Engineering work is taking place between Hackney Downs and Cheshunt, closing all lines via Tottenham Hale overnight from Monday evening until Wednesday morning.
Before 08:15 and after 23:59, trains that usually run via Tottenham Hale will be retimed, and will be diverted to run via Seven Sisters instead.
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 Journey Planner.