total of four scanners 28 with two scanners for each rail could be installed on a single structural beam 26 if necessary the configuration with multiple scanners has an added feature if a specific barcode in one array is damaged somehow the corresponding barcode in another array could be used to identify the location of the damaged barcode therefore identification repairing or replacement of the damaged barcode 4 is possible multiple scanners could increase the reliability of the track barcode system 100 of the present invention fig3 shows the second embodiment of the track barcode system 200 of the present invention comparing to the track barcode system 100 described above the major difference in this arrangement is the installation location of the barcodes 4 the barcodes 4 are installed at location c on the head of the rail 10 in order to avoid the direct contact of the barcode 4 with the moving wheels 24 which could destroy the barcode easily the location c has to be on the external side of the rail head as shown in fig3 for each array of barcodes 4 a barcode scanner 28 is needed similar to the track barcode system 100 of the present invention the barcode scanner is installed on the.