Some subway cities are located close enough to each other to be linked by intercity urban-rail lines. Some of those cities even come in clusters of many more than two. Happy metro city hopping!
Apart from metros or subways as the connecting means of transport, trams, LRTs and commuter metros shall also count here, but not long-distance railways. Planned connections or connections under construction are shown as dashed lines. Distances shown are as the crow flies.
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