| 559 05 | AIR CONDITIONING, HEATING AND VENTILATION, INCLUDING DEFROSTERS AND DEFOGGERS |
| 559 10 | BODY PANELS, FRAMES, AND PARTS |
| 559 12 | BOGIE ASSEMBLIES |
| 559 15 | BRAKE SYSTEMS |
| 559 17 | BRUSHES, CARBON |
| 559 18 | COMMUNICATIONS EQUIPMENT, AUTOMATED PEOPLE MOVERS, INCLUDING PARTS AND ACCESSORIES |
| 559 19 | COMMUNICATIONS EQUIPMENT, TRAIN, INCLUDING PARTS AND ACCESSORIES |
| 559 20 | COUPLERS, INCLUDING PARTS AND ACCESSORIES |
| 559 23 | CROSSING EQUIPMENT, RAILROAD, INCLUDING CROSSING SIGNS, INCLUDING PARTS AND ACCESSORIES |
| 559 25 | CURRENT COLLECTING SYSTEMS |
| 559 30 | DOOR OPERATORS |
| 559 31 | DOORS AND WINDOWS |
| 559 35 | DRIVE MOTORS AND ACCESSORIES |
| 559 40 | ELECTRICAL ACCESSORIES AND PARTS, NOT LIGHTING |
| 559 45 | GLAZING AND MIRRORS: WINDOW, DOOR AND WINDSHIELD GLASS |
| 559 46 | GOVERNORS AND SPEED REGULATORS |
| 559 47 | HEATERS, TRAIN TRACK |
| 559 48 | HUBODOMETERS, RAIL CAR |
| 559 49 | HYDRAULIC SYSTEMS, RAIL CAR |
| 559 51 | INSULATION, TRAIN |
| 559 55 | LAMPS AND LIGHTING, INTERIOR AND EXTERIOR |
| 559 57 | LUBRICATORS, TRAIN TRACK |
| 559 59 | RECYCLED RAIL VEHICLE ACCESSORIES AND PARTS |
| 559 60 | REFLECTORS |
| 559 65 | SEATING AND UPHOLSTERY |
| 559 67 | SHOCK ABSORBERS, RAIL VEHICLES |
| 559 70 | SIGNAGE: DESTINATION, ROUTING AND ADVERTISING |
| 559 71 | SIGNALS AND ACCESSORIES, TRAIN |
| 559 74 | STANCHIONS AND GRAB RAILS |
| 559 75 | SPECIAL PARTS (NOT OTHERWISE CLASSIFIED) |
| 559 76 | SWITCH STANDS |
| 559 77 | TOOLS, RAILROAD, POWER |
| 559 78 | TOOLS, RAILROAD, NON POWERED |
| 559 79 | TRACK HARDWARE: PLATES, JOINT BARS, SPIKES, CLIPS, BOLTS, NUTS, ETC., (SEE CLASS 570 FOR RAILS) |
| 559 80 | TRACTION POWER |
| 559 90 | WHEEL AND AXLE ASSEMBLIES |
| 559 91 | WHEEL TRUING EQUIPMENT, INCLUDING PARTS AND ACCESSORIES |
| 559 94 | WINDSHIELD WIPERS, INCLUDING PARTS AND ACCESSORIES |