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China train crash: Signal design flaw blamed
Serious flaws in a signalling system caused a fatal collision on China's high-speed rail network, officials say.
Thirty-nine people died when a train ran into the back of another which had stalled on a viaduct near Wenzhou after lightning cut its power supply.
The system "failed to turn the green light into red", said An Lusheng, head of the Shanghai Railway Bureau.
Chinese Premier Wen Jiabao, who has been visiting the crash site, vowed to "severely punish" those responsible.
"The country's development is for the people, so the most important thing is people's lives," Mr Wen told reporters at the scene.
"No matter if it was a mechanical fault, a management problem, or a manufacturing problem, we must get to the bottom of this.
"If corruption was found behind this, we must handle it according to law and will not be soft."
Mr Wen earlier promised to take steps to improve safety on the high-speed rail network - one of the government's flagship projects which it hopes highlights China's development.
Six carriages derailed and four fell between 20m to 30m (65ft to 100ft) from the viaduct after Saturday night's crash, which injured nearly 200 people.
The accident came just four years after the country's first high-speed trains began operating.
Rail experts had warned against the rush to build the world's longest and fastest high-speed rail network in record time amid safety concerns.
There are allegations that corners were cut during construction because of corruption, raising questions about infrastructure across the country.
Reproduced under licence from BBC News © 2011 BBC
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