"Normal traffic (has been) restored in Arakkonam-Katpadi section," Southern Railways Senior PRO, M Boopathy, said.
However, the status of the cancelled trains would remain the same, he said.
"The railway track affected by the derailment of the Muzaffarpur - Yesvantpur Express on Wednesday at Chitheri near Arakkonam has been restored at 10.30 hrs today. However, the trains which are already cancelled will remain cancelled due to operational reasons," Boopathy said in a statement.
Southern Railways had cancelled several trains, including the Bangalore-bound Brindavan express, Duronto Express between Chennai-Coimbatore, Kovai Express and West Coast Express following the accident.