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The width between tracks (called rail gauge) varies between system to system and country to country. I have no idea where you are from, but it seems like you come from a country which uses standard gauge. Tram systems around the world use an array of different gauges, some use standard gauge, others broad gauge or narrow gauge. You may also be interested in looking at tramway track, rail tracks and rail profile to learn more about tracks in themselves.  (talk) "