星期二的追尾事故大约发生在当地时间14：51 (06：51 GMT)，当时的地铁10号信息系统失灵。

Tuesday's crash occurred at about 14:51 local time (06:51 GMT) following a signal system failure at a subway station on Line 10, Shanghai Shentong Metro Group said.

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既可以检验刹车性能，也可以在发现刹车失灵时赢得控制车速的时间，也称为预见性刹车。

Since can examine brake properties as well as detect that putting on brakes won a control car soon while being out of order of time area concentration diagram, also be termed foresight brake.

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