The two drivers,a 47-year-old man and a 57-year-old man,both from Port Augusta,died at the scene.
The truck driver,a 75-year-old Queensland man,was taken to Broken Hill Hospital with minor injuries. He was later charged with two counts of causing death by dangerous driving
A Pacific National spokesperson said the company took the safety of its employees very seriously and had notified regulators.
“This incident is having a profound impact across the organisation,and our first priority is to ensure the highest level of care to the families of our drivers who have tragically died,” the spokesperson said in a statement.
The Australian Transport Safety Bureau said it had begun an investigation into the incident and was deploying Adelaide-based transport safety investigators with experience in train and railway operations to the scene.