Bogie

Bogie, by Wikipedia https://en.wikipedia.org/wiki?curid=4640 / CC BY SA 3.0 #Bogie #Locomotive_parts #Rail_technologies #Vehicle_technology A railway bogie A bogie （/ˈboʊɡi/ BOH-ghee） （in some senses called a truck in North American English） is a chassis or framework that carries a wheelset, attached to a vehicle—a modular subassembly of wheels and axles. Bogies take various forms in various modes of transport. A bogie may remain normally attached （as on many railroad cars and semi-trailers） or be quickly detachable （as the dolly in a road train or in railway bogie exchange）; it may contain a suspension within it （as most rail and trucking bogies do）, or be solid and in turn be suspended （as most bogies of tracked vehicles are）; it may be mounted on a swivel, as traditionally on a railway carriage or locomotive, additionally jointed and sprung （as in the landing gear of an airliner）, or held in place by other means （centreless bogies）. While bogie is the preferred spelling and first-listed variant in various dictionaries, bogey and bogy are also used. A bogie in the UK, or a railroad truck, wheel truck, or simply truck in North America, is a structure underneath a railway vehicle （wagon, coach or locomotive） to which axles （and, hence, wheels） are attached through bearings. In Indian English, bogie may also refer to an entire railway carriage. In South Africa, the term bogie is often alternatively used to refer to a freight or goods wagon （shortened from bogie wagon）. The first standard gauge British railway to build coaches with bogies, instead of rigidly mounted axles, was the Midland Railway in 1874. Bogies allow the wheelsets to more closely follow the direction of the rails when travelling around a curve in the railroad. Displacements of a bogie. Bogies serve a number of purposes: Usually, two bogies are fitted to each carriage, wagon or locomotive, one at each end. Another configuration is often used in articulated vehicles, which places the bogies （often Jac...