A skirt for a material transport system, eg conveyor belt (104), includes liner plates (111, 112) mounted on the conveyor side of body (200). Removal of certain plates (112) only requires access via the side of body (200) away from conveyor (104). To remove plate (112) requires removal of its support member (210) as well and so provides an aperture through which a workman can insert his hand to remove further plates (111, 112). Member (210) may be hel to body (200) using wedges inserted through eyes and this member (210) may be positioned with the aid of tabs and guides. Rubber dust seals are also provided which are clamped in place using plates and wedge arrangements. These seals must be removed prior to removal of liner plates (111, 112).