Abstract: A system of identifying rolling stock within a rail yard when additional rolling stock may be present on an adjacent track, the system including identification markers attached on opposite sides of a rolling stock, an identification marker reader located proximate a track upon which the rolling is upon operable to communicate with the markers to gather information from the markers, a processor in communication with the identification marker readers, and an algorithm within the processor for using the information associated with the identification markers to determine a location of the rolling stock.