Therefore, modern train control system can affect the quality of transmitted signals and used to ensure traffic safety and improve the daily operational efficiency is a key part of the track circuit.

轨道电路是现代列控系统中能够影响传输信号品质并且用来确保日常行车安全和提升运营效率的关键部分。

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Train control system is the key system, which is extremely important for traffic safety guarantee of the railway and improving the efficiency of the railway transport.

列车运行控制系统是保障高速铁路行车安全、提高运输效率的核心，它对保证行车安全、提高运输效率具有极其重要的作用。

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It provided for the train traffic order and ensured traffic safety. At present, the signal design of train control system needs continuous field tests to be improved.

目前列控系统的信号工程设计需要通过不断的现场试验进行完善，这样做的结果是会消耗大量人力和物力。

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The administration's funding authorization expires Sept. 30, and it needs more money to address the booming volume of air traffic, primarily because the air traffic control system needs safety and security upgrades.

FORBES: Magazine Article

Of course, a great leap toward alleviating our aggravating air travel experiences would be to remove the air traffic control (ATC) system from the auspices of the Federal Aviation Administration (safety oversight would remain with the government).

FORBES: Fact and Comment