The paper expounds the transportation load of China railways, and reviewed the position and role of increasing train operation density in raising transport capacity.
分析了我国铁路的负荷情况，回顾了加大列车密度在提高铁路运输能力中的地位和作用。
As the speed increases, the traditional train control system can not meet the requirement of the high speed railway and high density safe operation.
随着车速的提高，传统的列车控制系统已不能满足高速铁路高速度、高密度安全运行的要求。
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