page_title: Train
section_title: Bogies
hierarchical_section_title: Train / Bogies
caption_attribution_description: English: view from under the bogie of a train Deutsch: Blick auf ein Drehgestell, von unten Innotrans 2006, Berlin, 20 Sep 2006
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: A bogie (/ˈboʊɡi/ BOH-ghee) is a wheeled wagon or trolley. In mechanics terms, a bogie is a chassis or framework carrying wheels, attached to a vehicle. It can be fixed in place, as on a cargo truck, mounted on a swivel, as on a railway carriage or locomotive, or sprung as in the suspension of a caterpillar tracked vehicle. Usually, two bogies are fitted to each carriage, wagon or locomotive, one at each end. An alternate configuration, which is often used in articulated vehicles, places the bogies (often Jacobs bogies) under the connection between the carriages or wagons. Most bogies have two axles, as this is the simplest design, but some cars designed for extremely heavy loads have been built with up to five axles per bogie. Heavy-duty cars may have more than two bogies using span bolsters to equalize the load and connect the bogies to the cars. Usually, the train floor is at a level above the bogies, but the floor of the car may be lower between bogies, such as for a double decker train to increase interior space while staying within height restrictions, or in easy-access, stepless-entry, low-floor trains.
caption: View from under the bogie of a train
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