The control and the testing techniques of railroad train air conditioning become an important research direction.

列车空调系统控制和检测技术成为重要的研究方向。

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Outdoor air state changes affect passenger train air conditioning system greatly. So, it is necessary to regulate this system.

外气状态变化对客车空调系统的影响很大，因此有必要对客车空调系统进行调节。

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It is verified that this method is simple to use and thus provides theoretical basis for the designing and controlling of passenger train air conditioning system.

方法简单，应用方便，为客车空调系统设计和控制提供了理论依据。

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Saturday, the 232 passengers -- who'd stayed aboard the Chicago-bound train, which had air conditioning and food -- had been taken off and put on buses so they could reach their final destinations, according to Kulm.

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Platform doors can also allow for air-conditioning of train platforms and prevent litter from getting onto the tracks.

WSJ: Subway-Push Prevention Solution Would Be Very Costly for the MTA