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In metropolitan areas, the train service tends to use electrical power, and run quite frequently.In many cities, the train service runs in tunnels under the ground (or sometimes, raised above the ground), so it doesn't interfere with traffic in the city center.See, for example: https://en.wikipedia.org/wiki/Tokyo_MetroIn contrast, long-distance trains tend to use diesel power, and run much less frequently.It is only when a high-cost, high-speed train service is installed that it is cost-effective to electrify long-distance trains.See, for example: https://en.wikipedia.org/wiki/Shinkansen