Shuttle conveyors are trough belt conveyors mounted on trolleys with wheels which travels on rails. They receive material from hoppers located above them and in turn feed bunkers placed below them and spaced at desired distances. It can be unidirectional or reversible. A Shuttle conveyor has the same components as a belt conveyor. In addition, a shuttle conveyor has its own travel drive. Usually the axle of the wheel adjacent to the conveyor drive and tail pulley is directly driven through a hollow shaft mounted gearbox.