The Australian Rail Track Corporation (ARTC) says the East West rail corridor has reopened following the completion of restoration works after last week's train derailment north of Port Pirie.

Emergency services were called to a section of the East West railway line in South Australia between Port Augusta and Port Pirie about 5:40pm on Tuesday, January 6.

No-one was injured, and according to the ARTC, 11 wagons became "partially derailed".

The impact on deliveries could have been worse had the derailment happened before the Christmas period. (ABC News: Arj Ganesan)

An ARTC spokesperson said crews faced a "complex" 97-hour operation to recover the derailed wagons and restore the track, while working in challenging weather conditions.

"The cause of the derailment is under investigation, and ARTC will continue to work closely with the train operator and the Office of the National Rail Safety Regulator (ONRSR)," the spokesperson said.

"It enables all services to recommence from Sydney to Perth, Melbourne to Perth and Adelaide to Darwin."

Authorities are investigating after several train wagons derailed between Port Augusta and Port Pirie on January 6, 2025. (Supplied: Facebook)

Crews faced scorching conditions last week, with some towns recording their warmest temperatures in seven years, including nearby Port Augusta, which recorded 46.3 degrees Celsius on January 7.

SA Freight Council chief executive Jonathon Wilson said the impact on deliveries could have been worse had the derailment happened before the Christmas period.

SA Freight Council chief executive officer Jonathon Wilson. (ABC News: Ashlin Blieschke)

"The fact that it was addressed within a few days and the time of year helped minimise the impact on the industry," Mr Wilson said.

He commended crews for working in "very challenging conditions" to get the railway operational again.