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May 31, 2012

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Home » Metro » Public Services

Collision-proof sonar system nearly ready for Metro trains

NEW collision-proof systems will be tested on the city's subway trains in June, the latest effort of Metro authorities to prevent rear-end crashes like the one in September that injured hundreds.

The system, BatTrain, is based mainly on sonar, said officials of local Metro operator Shanghai Shentong Metro Group, at a rail and Metro exhibition yesterday in Shanghai.

Tests on sample trains are mostly finished, said a technician, Deng Qi. The system is expected to be tested on Metro Line 11 first.

So far, "the safe distance between two trains is set at 300 meters in accord with the train speed," Deng said. "Once the distance is less than that, the train drivers will receive a warning." If the driver fails to act, an automatic brake engages.

Yu Guangyao, president of Shentong, said the sonar system is helpful for train dispatch, especially "when the signal control system suffers glitches under an emergency."

Two subway trains collided along the Line 10 on September 27. Human error was blamed for causing the accident in which Metro staff used a manual dispatch procedure after signals were cut by a power loss.

Also, screen safety doors on Metro platforms controlled by motors instead of signals are expected to put into use at more stations of Metro Line 2 after they are tested.

The Metro operator said that the new doors will work with fewer breakdowns.


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