下面是一个「最佳化」的预处理信号车站布局。
Below is an image of an "optimal" Pre-signal station layout.
对在前方的预处理信号而言，该信号扮演了预处理离开信号的角色(实际上他们是预处理信号)。
They serve as an exit to a prior pre-signal, but are a pre-signal themselves.
如果你仍然不知道预处理信号如何工作，或不知道他们的长处在哪，我会试着在剩下的内容中解释清楚。
If you still can't understand how Pre-signals work or don't know what they are good for I will try to fill in the rest.
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