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一铁路运输传统的行车组织方法是以一个列车为基本输送单元。在一条线上用车站或信号机划分运行区间,每一区间在同一时间内只允许一列车运行,列车之间必需保持一定的间隔距离或间隔时间。一条铁路输送能力的大小,取决于列车的吨位和密度,后者受列车之间的间隔限制。长期以来,许多铁路为了增加输送能力,致力于加大列车吨位和缩小列车运行中的间隔,为此采取了各种技术改造措施。当这各种措施不能满足需要时,就增加线路。无论技改
A traditional method of transport organization is based on a train as the basic delivery unit. In a line with the station or signal to divide the operating range, each interval only allows a train operation at the same time, the train must maintain a certain distance or interval between. The capacity of a railway to transport depends on the tonnage and density of the train, which is limited by the distance between the trains. For a long time, many railways have been devoting themselves to increasing the tonnage of trains and reducing the intervals between train operations in order to increase their transmission capacity. Various technical improvements have been taken to this effect. When these various measures can not meet the needs, increase the line. Regardless of technical innovation