A platform assembly for use with sorting articles includes a first panel including a plurality of markers thereon, the markers forming a track on the first panel for transit thereabout by a plurality of vehicles. Each marker includes one or more magnetic characteristics for determining an orientation of the marker. A container is positioned about at least one of the plurality of markers. The platform assembly defines a first orientation in which the platform assembly is in a retracted position and a second orientation in which the platform assembly is in an extended position with a horizontal disposition. During operation, the vehicle is directed by a control system to deposit an article carried thereon into a container associated with a marker based on the location and the orientation of the marker.