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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.’

has prompted a tsunami warning of possible 3m (10ft) waves. The quake struck on Tuesday morning at about 06:00 local time (21:00 GMT, Monday), the Japan Meteorological Agency said. The depth of the quake was estimated to be around 11km (7 miles). In 2011, a large tsunami caused by a quake destroyed the Fukushima nuclear power plant. Broadcaster NHK said Tokyo Electric Power was checking the plant for damage.