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SYDNEY (Reuters) - Aurizon Holdings on Wednesday said it had restarted its main Goonyella coal haulage line on a limited basis nearly a month after Cyclone Debbie brought the line to a halt, cutting off much of the world’s sea-traded coal used in steelmaking.

Goonyella, used extensively by BHP Billiton was the last of Aurizon’s four rail systems to re-open to coal trains, although they are operating under reduced capacity.

“The opening of this section today will allow coal services to operate from mines across the Goonyella system to export terminals at Hay Point and Dalrymple Bay,” Aurizon said.

The Goonyella coal rail system, which typically carries 52 percent of Queensland state’s coal to port, was worst hit by the rains that accompanied Cyclone Debbie.