"A power failure was reported on the line at 11.50pm on Tuesday night and upon inspection the team confirmed that 11 spans of catenary and contact wire were stolen," the group said in a statement.
The railway line stretches up to 861 km (534 miles) from iron ore mines at Sishen in the Northern Cape to the Saldanha port in the Western Cape and is South Africa's main link for iron ore exports.
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