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在轨道交通系统中，列车的运行控制系统是确保列车运行安全和提高列车运行效率的核心子系统。列车运行机理的分析，列车追踪模型和算法的建立，是开发列车运行控制系统的基础。本文根据地铁列车追踪运行的特点，建立了固定自动闭塞系统下的元胞自动机模型，并对北京地铁2号线进行了模拟仿真。通过时空图和速度—时间—位移图，我们研究和探讨了地铁列车追踪运行的一些主要特性，分析了速度、时间、位置之间的相互变化。模拟结果再现了地铁列车运行时列车流的动态特性。通过对比分析模拟结果和实际运行结果发现，所提出的模型是一种有效的模型，可以很好地用来描述地铁中列车运行的特点。

Modeling Study for Tracking Operation of Subway Trains Based on Cellular Automata

In the system of railway traffic, the train operation control system is the key subsystem to ensure the safety and to enhance efficiency. The development of the train operation control system is based on analyzing the train tracking mechanism, and building train tracking models and algorithms. According to the characteristics of subway trains tracking, we have proposed a cellular model to simulate the tracking operation of trains in Beijing subway line 2. By means of speed-time-position graphs, we have investigated some important characteristics of subway train flow and have analyzed the relationships of speed, time, and position. The dynamic characteristics of train flow are well described in the simulation results. The comparison between the simulation and real-life data shows that the proposed model is an effective tool to describe the characteristics of subway trains tracking.