Moving Autoblock System (MAS) is a new train control system. It has many advantages over Fixed Autoblock System (FAS). As to the practical application of MAS, however, a lot of theoretical analyses need to be done, of which the capacity evaluation is of great importance. This paper focuses on the analysis of theoretical and practical headway models of train following operation in blocks under MAS condition. Based on the analyses, it is pointed out that MAS and FAS are quite differen in terms of headway of train following operation in blocks as well as block carrying capacity. The most significant difference is that, under MAS condition, headway of train following operation in blocks is neither fixed, nor in linear relation to train speed. According to the numerical results based on the typical parameters of rolling stocks of Chinese railway, the speed corresponding to the maximal capacity is around 70-80 km/h. It is also pointed out that a buffer coefficient should be introduced into the theoretical headway models to guarantee train operation performance.
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机译：移动自动封锁系统（MAS）是一种新的列车控制系统。与固定自动阻止系统（FAS）相比，它具有许多优势。然而，对于MAS的实际应用，需要进行大量的理论分析，其中容量评估非常重要。本文着重分析了在MAS条件下列车随行运行的理论和实践时距模型。在分析的基础上，指出了MAS和FAS在列车随行运行时的时距和模块的承载能力方面有很大的不同。最显着的差异是，在MAS条件下，成组的列车随行车距既不是固定的，也不与列车速度成线性关系。根据基于中国铁路机车车辆典型参数的数值结果，最大载速对应的速度约为70-80 km / h。还指出，应该在理论车距模型中引入缓冲系数，以保证列车的运行性能。
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