(WASHINGTON POST) — SHANGHAI — Part of a high-speed railway line collapsed in central China following heavy rains, state media reported, jolting railroad shares and reviving worries over safety.

About 7 kilometers (4 1/2 miles) of track were being removed after it sank at points where the line runs across a floodplain, the official Xinhua News Agency reported Tuesday. Initially the agency reported that only 300 meters (984 feet) of track had been affected by the collapse Friday near Qianjiang city in Hubei province. The railway line is due to open in May.

“We discovered the problem during the evaluation phase, and invited experts to reinforce the rails,” it quoted Wang Zujian, a director for Hubei’s provincial railway construction bureau, as saying.

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