The opening of the Beijing-Guangzhou line was pushed back by a year.

Wang Mengshu, deputy chief engineer at China Railway Tunnel Group, said the situation now is much better.

Many suspended projects have resumed construction, such as the link between Xi'an and Chengdu, he said.

The Ministry of Railways has also secured next year's investment of 600 billion yuan ($96 billion) for rail infrastructure, he said.

A staff member checks a train in Beijing on Dec 25, one day before the operation of the 2,298-km high-speed line connecting Beijing and Guangzhou on Wednesday. [Photo/Xinhua]

But some projects are still suspended, such as the Zhengzhou-Chongqing and Beijing-Zhangjiakou lines, he added.

"High-speed rail construction needs government funding. The loans the ministry borrowed have accumulated to nearly 4 trillion yuan so far, and each year the ministry needs to pay 80 billion yuan in interest", he said.

Besides the construction, Zhao said he believes high-speed trains could again hit speeds of 350 km/h in the future.

But he stressed that safety is the biggest priority and this could even mean reducing speed on some lines.

Trains that run at 200 km/h on the Harbin-Dalian railway in freezing temperatures could be slowed to 120 km/h or slower, if necessary. "Even suspending operations on that line is possible," he said.

Zhou Li, head of the ministry's science and technology department, said that the ministry has developed a full range of effective measures to manage safety.

Contact the writer at xindingding@chinadaily.com.cn

More about China's high-speed rail:

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China to open world's longest high-speed rail line

SW China starts track-laying for first high-speed railway

High-speed railway links Northeast China

China's operating high-speed rail exceeds 7,000 km