Passengers are facing disruption after Metro trains were halted on the Sunderland line.
Trains between East Boldon and South Hylton were knocked out by a points failure earlier this afternoon.
Trains are now running into Sunderland, but the Metro service is suspended between Park Lane and South Hylton.
A replacement bus operated by Kingsley's Coaches is now calling at all affected stations.
Metro bosses have apologised for the inconvenience caused.
Other rail services on the line are also facing disruption.
The latest update states: "We currently have a service suspension between Park Lane and South Hylton in both directions, with a replacement bus service in operation.
"There may be some delays from Park Lane to Airport due to this, and we apologise for any inconvenience caused."