介绍了城市轨道交通不同信号闭塞方式及其追踪列车间隔时间的计算方法，建立了多列车追踪运行的仿真系统，并进行了算例的设计。

This paper introduces different signal block modes and the method which was used to calculate tracking intervals between trains, and establishes simulation system for multi-train tracking.

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针对我国传统的继电联锁方式的铁路信号自动闭塞系统，文章介绍了一种基于计算机联锁方式的改进方案。

In this paper an improved solution based on computerized interlocking is proposed against the traditional re-lay-interlocking-model automatic block system in railway signalling in our country.

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