Interlining can cause some operational difficulties. For example, if the vehicles are running at a very tight interval, even a small delay on one line could impact several lines. It's less of an issue for street-running vehicles like buses, streetcars or (to a lesser extent) LRT which tend to have shorter stopping distances and operate with less strict signalling requirements. But for something like a metro, it's difficult to interline without automation. In Montreal's case, automation is possible, but its proprietary technology would make it very costly.
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I've always struggled with reality. And I'm pleased to say that I won.
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