In rail transport, a train consists of more than a few connected rail vehicles that are capable of being moved together along a guideway to transport freight or passengers from one place to another along a planned route. The guideway generally consists of conventional rail, but may be monorail or maglev. Propulsion for the train may come from a multiplicity of sources, but often from a locomotive or self-propelled multiple unit. A train can consist of a combination of a locomotive and attached carriages (also known as coaches or cars) or wagons, or a self-propelled several unit (or occasionally a single powered coach, called a railcar). Trains can also be hauled by horses, pulled by a lead, or run downhill by gravity.
Special kinds of trains running on related special 'railways' are atmospheric railways, monorails, high speed railways, maglev, rubber-tired underground, funicular and cog railways.
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