A signalling fault is causing disruption for Potters Bar rail passengers.

Great Northern said at 12.30pm today (June 7) that the fault between Potters Bar and Hadley Wood means trains have to run at a reduced speed on northbound lines between Alexandra Palace and Potters Bar.

Disruption, including delays of up to 20 minutes, is expected until 3pm.

The Great Northern website states: “There is a reported fault with the signalling system and Network Rail, who own and maintain the equipment, have staff attending to effect repairs.

“Whilst this is ongoing, services may be delayed or subject to alteration.

“Once the fault is repaired, staff will be working to restore the train service to the normal timetable as quickly as possible.”