根据城市轨道交通外部成本的评价内容，得出轨道交通的外部成本与其他交通运输方式相比，还是小得多。
According to the URT external cost evaluation system, the author gets the result that the external costs of rail transportation is much smaller than those of other transportation methods.
分析和标定了模型的相关参数及各运输方式的时间、费用评价值。
The correlative parameter in this model, the time and expense evaluations of each transportation mode were analyzed and demarcated.
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