Topic summary
Monorails

Extracted from the Wikipedia article Monorail.
Differentiation from other transport systems
Monorails have found applications in airport transfers and medium-capacity metros. To differentiate monorails from other transport modes, the Monorail Society defines a monorail as a "single rail serving as a track for passenger or freight vehicles. In most cases, rail is elevated, but monorails can also run at grade, below grade, or in subway tunnels. Vehicles either are suspended from or straddle a narrow guide way. Monorail vehicles are wider than the guideway that supports them."