Have you ever heard of a bogie?

Have you ever heard of a bogie?

A bogie is a piece of equipment on which the axles and wheels are fixed. It is movable in relation to the chassis of the vehicle (locomotive or wagon) and is designed to guide the train through the curves of the railway line. The bogie is an essential element of the wagon or carriage which consists of two or three axles, a damping system and a set of wheels through which the connection to the rail is made.