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Monorail

Somewhere between light and heavy rail in terms of carbon footprint, monorail systems usually use overhead single tracks, either mounted directly on the track supports or put in an overhead design with the train suspended.

Monorail systems are used throughout the world (especially in Europe and east Asia, particularly Japan), but apart from public transit installations in Las Vegas and Seattle, most North American monorails are either short shuttle services or privately owned services (With 150,000 daily riders, the Disney monorail systems used at their parks may be the most famous in the world).