Abstract: The invention relates to a monorail tramcar type conveyor having a driven carriage connected to a free rolling carriage for traveling along the top of the rail. Both the driven and free carriages have a rectangular frame, from which vertical axis guide rollers are cantilevered so as to engage the sides of the rail. The top portion of the frames have a vertical opening which is surrounded by the frame, and the driven and free rolling wheels which ride on the top of the rail are loosely fitted into these openings on the respective driven and free rolling carriages.