It caused severe delays on the entire line on the entire line between Leytonstone and Epping and Woodford via Hainault.
Earlier, the Elizabeth line had severe delays between Paddington and Heathrow Airport after a Network Rail track fault, which has since been fixed.
Elsewhere, the Bakerloo line continues to have minor delays due to a shortage of trains.
Passengers on a London Underground line face delays after a trespassing incident.
The Central line has been hit by delays after a trespasser entered the tracks this morning.