British Transport Police was called to Dalston Kingsland station at around 10.45am today (December 10).
Officers searched the tracks and found a man near Canonbury station, who was later arrested by Metropolitan Police officers.
A spokesperson for the British Transport Police said: “Officers were called at around 10.45am today (December 10) to reports of a trespasser on the tracks at Dalston Kingsland railway station.
“Officers responded and searched for the man.
“He was located near Canonbury railway station and arrested by colleagues from the Metropolitan Police.”
Both the Mildmay and Windrush lines were suspended after the incident, later facing “severe delays” once services were resumed.
Lines have since reopened and are running a good service.
