The crash happened while controllers were running operations using a manual system following an equipment failure, Shanghai Shentong Metro Group Co. said in a statement.

碰撞发生于因信号设备故障采用人工调度的时段，上海申通地铁有限公司在一份声明中称。

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Airplanes occasionally crash into water but rarely in mid-ocean, where the uncharted bottom is dark and can be treacherous even for unmanned diving equipment.

飞机偶尔会坠入水中，但很少会坠毁在大洋中部，这里的海底状况未知，光线黑暗，即便对无人驾驶潜水设备来说也变幻莫测。

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The Spanish crash hit silicon-wafer producers, the manufacturers of equipment for solar-cell producers and the makers of cells across the world.

西班牙市场的坍塌影响了全世界的硅片生产商，太阳能电池板生产商和电池板生产商。

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Nine safety board teams will examine aspects such as train operations and communications, signals, tracks, crash-worthiness of equipment, maintenance and survivability -- ease of fleeing the trains after the crash and other survivability factors, Hersman said.

CNN: Investigator: D.C. Metro crash 'a scene of real devastation'

The report found that serious design flaws in control equipment and improper handling of the lightning strike led to the crash.

BBC: China bullet train crash 'caused by design flaws'

They now say the crash was caused by a severe design flaw in the railway's signalling equipment.

BBC: China's 'Grandpa Wen' seeks to soothe crash tension