Abstract: A training idler roller assembly is provided in which the idler roller (6) is adapted to slew in a plane generally parallel to that of the conveyor belt (3) to move one or other ends of the roller (6) in the general direction of travel of the conveyor belt so guide the belt to return to the central desired position in the event that it drifts laterally. An idler roller unit (6) is compose of one or more idler rollers (1, 26) mounted for free rotation on one or more axles (4) with the idler roller unit having a suspension formation (13) associated with each end thereof whereby the end of the idler roller unit may be supported relative to a conveyor structure (17, 19).