The Urban Mass Transit (UMT) system has the characteristics such as little intervals, short distances between stations and simple station track layouts.

• 摘要城市轨道交通系统具有列车运行间隔小、站间距离短、车站线路布置比较简单等特点，一旦列车发生运行延误，其传播的速度快、影响范围大。