A monorail is a railway in which the track consists of a single rail. The term is also used to describe the beam of the system, or the vehicles traveling on such a beam or track. The term originates from joining “mono” (one) and “rail” (rail), from 1897,[1] possibly from German engineer Eugen Langen, who called an elevated railway system with wagons suspended the Eugen Langen One-railed Suspension Tramway (Einschieniges Hängebahnsystem Eugen Langen). Colloquially, the term “monorail” is often used to describe any form of elevated rail or people mover.[3] More accurately, the term refers to the style of track,[note 1] not its elevation, with ‘Mono’ meaning ‘one,’ and ‘Rail’ meaning ‘rail.’