Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. A bogie 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. A bogie in the UK, or a wheel truck, or simply truck in the USA and Canada as well as Mexico, is a structure underneath a train to which axles are attached through bearings. Usually two bogies are fitted to each carriage, wagon or locomotive, one at each end. An alternate configuration often is used in articulated vehicles, which places the bogies under the connection between the carriages or wagons.