| 1 | MRU | Museumseisenbahn Rahden-Uchte e.V. | | DE | VKM |
| 2 | MRUA | M & R TRUCKING INC | | | SCAC4 |
| 3 | MRUB | MARUBA S C A | | | SCAC1 |
| 4 | MRUB | MARUBA S C A | | | SCAC4 |
| 5 | MRUF | MAERSK-RICKM | | | SCAC4 |
| 6 | MRUL | M & R TRUCKING LLC | | | SCAC4 |
| 7 | MRUM | MARVELL, MAURICE C | | | SCAC4 |
| 8 | MRUS | MARCUS TRUCKING COMPANY | | | SCAC4 |
| 9 | MRUX | Union Refrigerator Transit Lines | eliminated 7/1967 | | NAKINA |
| 10 | MRUX | Union Refrigerator Transit Lines, a Division of the General American Transportation Corp. | 1/1950-10/1966 | | NAKINA |
| 11 | MRUX | Union Refrigerator Transit Co. | 1/1941-4/1947 | | NAKINA |
| 12 | MRUX | Union Refrigerator Transit Co. (Morrell Refrigerator Car Co.) | 7/1937-4/1938 | | NAKINA |
| 13 | MRUX | Morrell Refrigerator Car Co. (Dissolved) | 7/1935 | | NAKINA |
| 14 | MRUX | Morrell Refrigerator Car Co. (Dissolved) | Apr-38 | | NRHS |
| 15 | MRUX | Union Refrigerator Transit Lines, a Division of the General American Transportation Corp. | 1/52-10/66 | | NRHS |
| 16 | MRUX | Union Refrigerator Transit Lines | eliminated 7/67 | | NRHS |
| 17 | MRUX | UNION REFRIGERATOR TRANSIT CO. (GENERAL AMERICAN TRANSPORTATION CORP.) [MORRELL REFRIGERATOR CAR CO.] | | | PWRC |