The incident has been the cause of much concern around the country, as first-tier cities such as Beijing and Shanghai are expanding their metro services, and second- and third-tier cities are building their own subway systems at a brisk pace.
Metro companies in a number of cities approached by China Daily on Monday said they never had services interrupted by unknown or Wi-Fi signals.
Shanghai Shentong Metro Group, the main operator of Shanghai's subway lines, said no signal interference has ever occurred on metros in the city despite metro lines 6 to 11 using the same CBTC system as their wireless communication system.
"But the interference is possible in theory," said Yang Di, a manager at Shentong.
Jia Peng, spokesman for Beijing Subway Operation Co, said the signal system of subway networks operated by the company never experienced problems like the case in Shenzhen and he firmly believes in the safety of Beijing's subway signal system.
"The CBTC system we use is the most widely used signal system in the world and also the most tested," he said.
Despite the confidence of some metro operators, mobile communication experts said it remains a concern that portable Wi-Fi signals can be a potential hazard to subways using CBTC systems.
Landmark building should respect the public's feeling
Feedback
RSS
