Metro signal system is core component to ensure trains efficient and safe operation.

地铁信号系统，是保证列车高效、安全运行的核心部件。

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As a core in metro operation system, the information security in AFC system needs to be assured adequately.

自动售检票系统作为地铁运营体系的核心部分，其信息的安全性需要得到充分保证。

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The subway's operator, Shanghai Metro Operation Co Ltd, was investigating and had promised "severe punishment" if employees were found to have misused the video, the paper said.

报纸称，地铁的运营商上海地铁运营有限公司正对此事展开调查，并承诺如果发现公司员工滥用录像则会采取“严厉惩罚”。

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The police operation at the metro depot took place shortly before 04:00, with about 100 riot police officers entering the area where workers had barricaded themselves overnight.

BBC: Greece crisis: Athens 10-day metro strike ends

The strike has shut down much of the public transport network, with no metro or electric railway services in operation.

CNN: Thousands protest austerity measures in Greece

Metro-North and state officials are still planning to repeat on Tuesday the bus and shuttle-train operation they used Monday morning to help move 30, 000 displaced commuters through southwestern Connecticut.

WSJ: Metro-North Is Set To Restore Full Service Wednesday