After last month's terrible train crash, Beijing has ordered trains to run more slowly. The government did not say how slowly the high-speed trains should go. It just said that on new lines they should be slower for safety reasons.
Building the world's biggest high-speed railway has been a top goal for China. But the crash between two trains on July 23 killed 40 people. Citizens and the media were very angry.
China's Prime Minister, Wen Jia bao, has ordered safety checks on all the high-speed lines still being built and those already working.
The crash in July is being blamed on a signal failure. The signals were knocked out by lightning during a storm. One train stopped on the track and the other train was not warned. It crashed into the first train from behind, sending some coaches off a bridge.
It was the worst train crash in China since 2008.
Some people say China is moving to modernise too fast. Others say that train crashes happen in other countries too and no one makes such a big fuss over them.
