The signal system failure occurred at around 7 am and a number of passengers were trapped in the train for more than one hour before it moved slowly to the nearest station.
Subway broadcasting said that there was a signal system failure and advised passengers to take others means of transport such as public buses Interchange services were closed.
Beijing's Line 4 subway line was restored after few hours of suspension of operation after the problem was rectified. The Line 4's suspension made other subway lines, such as Line 2, 5, and 10, even more crowded.
The line, which runs 50 kilometers with 35 stations through Beijing from south to north, is one of the busiest in the capital.


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