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| AAR Code | Car Type | AAR Description |
| FC | Flat cars specifically equipped to carry trucks, trailers, containers, chassis, or removable trailer bodies for the transportation of freight in TOFC/COFC service. | |
| FM | General flatcar | Ordinary flat car for general service. This car has flooring laid over sills and without sides or ends. |
| GB | Open top car having fixed sides, fixed or drop ends and solid bottom, suitable for mill trade. | |
| GH | Open top car having fixed sides, drop ends and drop bottom, consisting of doors hinged at center sills to dump outside of rails. | |
| HFA | Open top, self-clearing car having fixed sides and ends and bottom consisting of divided hoppers at center with doors hinged lengthwise, dumping outside and/or inside of rail; also one divided hopper, each end, extending from end of car to bolster with doors hinged lengthwise of car and dumping outside of rails. | |
| HK | Open top self-clearing car having fixed sides and ends and bottom consisting of two or more divided hoppers dumping outside and/or inside or rails. | |
| HM | General hopper | Open top, self-clearing car having fixed sides and ends, and bottom consisting of two divided hoppers with doors hinged crosswise of car and dumping between rails. |
| HMA | Open top, self-clearing car having fixed sides and ends and bottom consisting of two divided hoppers with doors hinged lengthwise of car and dumping between rails. | |
| LO | Covered hopper | A permanently enclosed car, other than a box car, regardless of exterior or interior shape, for handling bulk commodities, with or without insulation and provided with openings for loading through top or sides with weather-tight covers or doors. Car may be provided with one or more bottom openings for unloading, with tight fitting covers, doors, valves, or tight fitting slide or gate to prevent leakage of lading. Car may be provided with facilities for discharge of lading through openings in top or sides and may have one or more compartments. Mechanical or other means may be provided within car to expedite loading or unloading. |
| LP | Pulpwood gondola | An open-top car having solid bottom and fixed ends equipped with sloping floor or longitudinal floor risers or side stakes for the handling of pulpwood and not suitable for general commodity loading. |
| LG | Gondola car equipped to handle one or more demountable containers for the transportation of commodities not under refrigeration. | |
| LU | Thrall-door car | An enclosed car with roof, having a special metal beam of heavy design at top of each side to support a series of retractable overhead side doors and the appurtenances, or other types of doors, running substantially the length of car, which beams also support the roof details. Car may be equipped with special loading devices or racks for handling various commodities. |
| MWD | Dump Cars. On the type of contractors’ car used for building up fills; the body of the car dumps being raised by means of counterweight, air or hand power. | |
| NE | Caboose | All cabooses. |
| RB | Insulated boxcar | Bunkerless refrigerator car similar in design to an RS car with or without ventilating devices and with or without devices for attaching portable heaters. Constructed with insulation in side ends, floor and roof to meet maximum UA factor requirement of 250 BTU/F/Hour for 50-foot cars and 300 BTU/F/Hour for 60-foot cars. Effective for cars ordered new after March 1, 1984. Cars built or rebuilt prior to March 1, 1984, must have been constructed with a minimum of 3 inches of insulation in the sides and ends and 3-1/2 inches in floor and roof based on the insulation requirements given in AAR Standard S-2010 or a thickness reduced in proportion to the thermal conductivity of the insulation. |
| RBL | Insulated boxcar | Car similar in construction to an RB type car, but equipped in addition with adjustable loading or stowing devices. (10/57-4/99). Note: Cars equipped with interior side rails only, built new, rebuilt or reclassified on and after January 1, 1966, in order to qualify for the RBL designation, shall have a minimum of four (4) usable side rails on each wall of car, each extending from doorway to approximately four (4) feet from end of car. |
| RP | Mechanical reefer | Mechanical Refrigerator car equipped with or without means of ventilation and provided with apparatus or other device for furnishing protection against heat and/or cold. Apparatus operated by power other than through the car axle. |
| RPL | Mechanical reefer | Mechanical Refrigerator. Similar to RP but equipped in addition with adjustable loading or stowing device. |
| RS | Ice reefer | Bunker Refrigerator car equipped with ice bunkers. Designed primarily for use of chunk ice and with or without means of ventilation. |
| XAP | Automobile parts. A house car similar in design to XM but specially equipped with permanent interior fixtures for stowing automobile parts, not suitable for general service loading of other miscellaneous quantities. | |
| XL | Loader equipped. Similar in design to XM, with steel perforated side walls or equipped with interior side rails for securement of certain types of lading and/or permanently attached movable bulkheads.Note: Cars equipped with interior side rails only, built new, rebuilt or reclassified on or after January 1, 1966, in order to qualify for the XL designation, shall have a minimum of four (4) usable side rails on each wall of car, each extending from doorway to approximately four (4) feet from end of car, plus facilities in doorway to accommodate doorway members. The facilities in the doorway are not required in cars equipped with plug type doors. | |
| XM | General boxcar | Boxcar for general service equipped with side or side and end doors. |
| XME | Loader equipped. Similar in design to XM, with steel perforated side walls or equipped with interior side rails for securement of certain types of lading and/or permanently attached movable bulkheads.Note: Cars equipped with interior side rails only, built new, rebuilt or reclassified on or after January 1, 1966, in order to qualify for the XL designation, shall have a minimum of four (4) usable side rails on each wall of car, each extending from doorway to approximately four (4) feet from end of car, plus facilities in doorway to accommodate doorway members. The facilities in the doorway are not required in cars equipped with plug type doors. | |
| XML | Loader equipped. A house car similar in design to XM, either fully or partially lined with steel perforated side walls and equipped with protruding interior side rails, stanchions and cross bar members for securement of certain types of lading. | |
| XMP | A house car similar in design to XM but specially equipped for specific commodity loading other than automobiles and parts and not suitable for miscellaneous commodity loading. | |
| XP | Boxcar similar in design to XM, but which is specially equipped, designed, and/or structurally suitable for a specific commodity loading; except boxcars (XF, XM, XMI) dedicated to the transportation of commodities in Paragraph A, Rule 97, AAR Interchange Rules, must be designated XP. |
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