将安排列车运行线的问题看作周期事件安排问题，并借助周期约束图及周期势差模型，可以建立周期运行图网络模型。
Considering arranging train paths as arranging a periodic event, in virtue of the periodic constraint graph and the periodic tension model, the periodic train diagram network model is established.
欢迎您乘坐地铁13 号线列车，列车运行前方是本次列车的终点站--- ， --- 是换乘车站，换乘地铁- 号线的乘客请在--- 站下车。
Welcome to take subway line 13, the next station is ---, terminal of the train, --- is a transfer station, passengers for line- please prepare to get off the train.
第一台新列车将在2009年在首都线投入使用，而且，连同新的信号传输，第一批新列车将提高地下路线的运行次数。
The first new train will enter service on the Metropolitan line in 2009 and, together with new signalling, the new fleets will improve journey times on the sub-surface lines.
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