The present invention relates to a railway wagon comprising a base structure (201) having a support platform (202) and two carriages (203) configured to support the support platform (202) and allow movement of the base structure (201) along rails. The carriage also comprises a conveyor (100) comprising: a support frame (1), a plurality of rollers (10) movable by rotation around a rotation axis (A) thereof and aligned along a predetermined trajectory transverse to the rotation axes (A). The multiplicity of rollers (10) comprises: a first end return roller (11'), a second end return roller (11") spaced from the first end return roller (11'), a predetermined number of intermediate rollers (12) interposed between said first and second end return rollers (11', 11"). The conveyor further comprises a belt (20) wound around the rollers and a motor (30) active on at least a roller (10) to define a motorized roller (13). The conveyor (100) comprises an interconnection system (40) configured to connect the motorized roller (13) with at least a further roller (10) to define a driven roller (14).