page_title: Train
section_title: Rapid transit
hierarchical_section_title: Train / Passenger trains / Within cities / Rapid transit
caption_attribution_description: English: The M100-train has just arrived to Kamppi, in Helsinki.
context_page_description: A train is a form of rail transport consisting of a series of connected vehicles that generally run along a railroad track to transport passengers or cargo. The word "train" comes from the Old French trahiner, derived from the Latin trahere meaning "to pull" or "to draw".
  Motive power for a train is provided by a separate locomotive or individual motors in a self-propelled multiple unit. The term "engine" is often used as an alternative to locomotive. Although historically steam propulsion dominated, the most common types of locomotive are diesel and electric, the latter supplied by overhead wires or additional rails. Trains can also be hauled by horses, pulled by engine or water-driven cable or wire winch, run downhill using gravity, or powered by pneumatics, gas turbines or electric batteries.
  The track usually consists of two running rails with a fixed spacing, which may be supplemented by additional rails such as electric conducting rails and rack rails. Monorails and maglev guideways are also occasionally used.
  Passenger trains include passenger-carrying vehicles and can often be very long and fast.
context_section_description: Large cities often have a rapid transit system, also called "metro", "underground", "subway" or "tube". The trains are electrically powered, usually by third rail, and their railroads are separate from other traffic, usually without level crossings. Usually they run in tunnels in the city center and sometimes on elevated structures in the outer parts of the city. They can accelerate and decelerate faster than heavier, long-distance trains.
  The general term "rapid transit" is used for public transport such as commuter trains, metro and light rail. However, services on the New York City Subway have been referred to as "trains", while services on the London Underground are commonly referred to as "tube trains" or "tubes".
caption: A metro train on the Helsinki Metro
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