中文摘要：

这篇论文论述一个扩充网络模型代表城市的运输系统。通过如此的网络模型，城市的运输赋值问题能容易象一个概括交通网络一样被建模。同时，在如此的扩充运输网络的可行线路然后根据旅客行为被定义。旅客旅行花去包括走的时间，等待时间，在里面车辆时间和转移当在车站的拥挤和在运输车辆的拥挤都被考虑时，时间被提出。在这些的底上，为城市的运输任务问题的一个平衡模型被介绍，基于的算法也是的一个改进最短的路径方法建议解决它。最后，一个数字例子被提供说明我们的途径。

英文摘要：

This paper presents an augmented network model to represent urban transit system.Through such network model,the urban transit assignment problem can be easily modeled like a generalized traffic network.Simultaneously,the feasible route in such augmented transit network is then defined in accordance with the passengers＇ behaviors.The passengers＇ travel costs including walking time,waiting time,in-vehicle time and transfer time are formulated while the congestions at stations and the congestions in transit vehicles are all taken into account.On the base of these,an equilibrium model for urban transit assignment problem is presented and an improved shortest path method based algorithm is also proposed to solve it.Finally,a numerical example is provided to illustrate our approach.