A monorail is a railroad in which the track consists of a single lane. The term is also used to describe the system beam, or vehicles traveling on such a beam or track. The term originates from joining "mono" and "rail" (railroad), from 1897, possibly from the German engineer Eugen Langen, who called an elevated railway system with suspended wagons the Eugen Langen One-railed Suspension Tramway (Einschieniges Hängebahnsystem Eugen Langen).
Colloquially, the term "monorail" is often used to describe any form of elevated railway or motor of persons. More precisely, the term refers to the style of the track, not to its elevation, with 'Mono' means 'one' and 'Rail' indicating the type of track structure used. The monorails have found applications in the transfer of airports and meters of medium capacity. To differentiate monorails from other modes of transport, the monorail society defines a monorail as a "single lane that serves as a runway for passenger or cargo vehicles. In most cases the railway is elevated, but the monorails they can also function in degree, Monorail vehicles are wider than the guide road that holds them.