| XM | Box car for general service especially for lading requiring protection from the weather equipped with side doors and/or end doors |
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| XAR | Automobile Device, similar to an XM except unlined, side and/or end doors. equipped with loading racks and/or floor tubes with tie-downs chains for loading setup automobiles and trucks suitable for general service or misc . |
| XMR | Same as an XAR except fully lined. |
| XAP | Similar to an XM except specially equipped with permanent interior fixtures for stowing automobile parts. Not suitable for general service. |
| XML | Loader equipped. Similar to an XM except equipped fully or partially lined with steel perforated side walls or equipped with protruding interior side rails, stanchions and crossbar member for stowing automobile parts and adaptable for other commoditys. |
| XME | Merchandise Loading. Similar to an XM with wooden lining and fitted with stowing fixtures which can also be used for general merchandise. |
| XMP | Similar to an XM but specially equipped for specific commodity loading other than automobile and parts and not suitable for misc commodities. |
| XI | Similar to an XM but partially or wholly insulated. Not equipped with ventilating or refrigeration devices. |
| XT | A house car with or without doors, no insulation either metal lined or enclosing one or more tanks. |
| VA | Fruit-Vegetable Ventilated box. Similar to an XM but with either end oand/or side ventilators, with or without double sliding side doors. When equipped with double doors one door is solid, one door is screened. |
| VM | Similar to a VA except partially insulated. |
| VS | Similar to an XM except equipped with insulation and hinged swinging side doors, and means of ventilation. Not equipped for refrigeration although sometimes equipped with shallow boxes under hatches or ventilating openings to protect lading, but not to contain ice. Sometimes called "Produce Car" |