Automatic Car Identification Plate, International Car Company (1973), Chessie System (B&O) 903734, La Grange, TX
Automatic Car Identification (ACI) plate. These were mandated by the Association of American Railroads (AAR) in 1968 and were installed on all equipment by 1970. Each plate consists of 13 double bars comprised of red, blue, black or small black and white checks. This color coded bar system was developed by General Telephone and Electronics (GTE) and called KarTrak.
The system failed to and was abandoned in 1978.
This plate is read from the bottom up. The first set is "Start." The second is the equpment code, 8. The next three sets (3, 4 & 5) indicate the owner of the equipment, 050. The next six sets (6 through 11) indicate the car number, 003734. The net set (12) is "Stop." And the last set (13), at the very top, is a check digit, 5.