The tracks that every train enters and exits stations are built up downhill and uphill to reduce the subway operation costs.

每辆地铁在出站时轨道都是下坡的，进站时的轨道都是上坡的，这样的设计可以降低运营成本。

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In this paper, combined with the requirements of subway operation, the operation strategy, operation mode and control of ice storage system are introduced.

结合地铁的运营需求，介绍了冰蓄冷系统在地铁中应用的运行策略、运行模式及其控制。

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Four elements, i. e. person, substance, rules and regulations and social environment are put forward after analyzing the subway operation safety situations at home and abroad.

在对国际和国内地铁运营安全形势分析的基础上，笔者提出了地铁运营安全防范的人、物、制度和社会环境四要素，以利于下一步地铁运营安全工作的开展。

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At the time, police credited the subway operation with driving down crime there.

WSJ: Take the bait? NYPD anti-theft tactics criticized

It has dozens of sub-products within it, from Google Transit (public transportation, e.g. subway, information and routing), Live Traffic, StreetView (and the incredible operation that makes that happen), Local search, image recognition technology for reading street and business signs, the list goes on and on.

FORBES: Why did Apple Fire the Maps Product Manager?