There are big disruptions on the T8 Airport and South Line this afternoon, following issues at Revesby.
Urgent track equipment repairs are underway after lightning strikes damaged equipment.
Sydney Trains has advised that the disruption is impacting those travelling towards the city, with services diverted via Regents Park.
Repair crews are currently looking to fix the issue.
Buses are being called in to assist with the afternoon commute between Glenfield and Revesby.
People are advised to check real time apps and indicator boards for the latest updates.