| RA | House car fitted with insulation and brine tanks. Designed primarily for the combined use of crushed ice and salt and usually without ventilating devoces. Used chiefly for meats and packing house products. |
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| RAM | Brine Tank Refrigerator. Similar to RA but equipped with beef rails. |
| RB | Beverage, Ice, water or vinegar refrigerator. Similar in design to Bunker Refrigerator, except not equipped with ice bunkers and with or without ventilating devices. |
| RCD | Solid Carbon-Dioxide Refrogerator. House car equipped with insulation, with or without means of ventilation and provided with a system of refrigeration in which solid carbon-dioxide is employed as the primary refrigerant. |
| RP | Mechanical Refrigerator. House car equipped with insulation with or without means of ventilation and provided with an apparatus or other device for providing furnishing protection against heat and/or cold. The apparatus operated by direct mechanical drive from the car axle. |
| RPB | Mechanical Refrigerator. House car equipped with insulation with or without means of ventilation and provided with an apparatus or other device for providing furnishing protection against heat and/or cold. The apparatus operated by electro-mechanical drive from the car axle. |
| RS | Fully insulated house car equipped with ice bunkers. Designed primarily for use of chunk ice and with or without means of ventilation. |
| RSM | Bunker refrigerator. Similar to RS but equipped with beef rails. |