TRAIN services resumed on the Hunter rail line on Monday morning after repairs to the site where two coal trains collided last week were completed.
Australian Rail Track Corporation reopened the line at 1am on Monday after working through the weekend to replace about 1500 sleepers and fix equipment across 10km of the line.
Passenger train services, which were being replaced by buses between Singleton and Scone, have resumed.
However, customers on the Hunter line are advised to allow for extra travel time, listen to announcements and check indicator boards regarding their services.
Both the National Rail Safety Regulator and the NSW Office of Transport Safety Investigations were examining the derailment and collision that occurred on Wednesday.
The derailment, which occurred between Singleton and Muswellbrook near Newdell Junction, may have been been impacted by empty coal wagons in an otherwise loaded train.
A second coal train travelling in the opposite direction collided with the derailed wagons.
Investigators are yet to release a report.