‘Avoid Northern Line’ warning as tree blocks Overground services into Euston – live London Evening StandardNorthern Line delays: TfL yet to identify fault behind signal failure The TimesTfL urges commuters to ‘avoid’ entire line due to severe delays The IndependentLondon Underground commuters faced severe delays through morning and evening rush hour MyLondon‘Avoid service’ as Northern line faces severe delays for THIRD day Newham Recorder