Passengers were also stranded in the premium Airport Express Line for around 25 minutes in the morning after the doors of a train developed snag at the IGI Airport station.
On Red Line, trains are running in a short loop between Tis Hazari and Rithala stations and on a single line between Kashmere Gate and Dilshad Garden stations.
"Services have been curtailed from 1.30 PM onwards. Over-Head Equipment (OHE) staff is looking into repair of catenary wire which is found broken at two locations between Dilshad Garden and Shastri Park," a metro official said.