Commuters are being warned of disruption on the Elizabeth Line until the end of the day due to track failure in west London.Urgent repairs to the track in the Southall area means some lines are blocked, National Rail has said.As a result, trains running between Reading / Heathrow Airport and London Paddington may be cancelled, delayed by up to 15 minutes or revised.This includes the Elizabeth Line, although TfL's website is not currently reporting any delays.