| 1 | URMX | Union Refrigerator Transit Lines, a Division of the General American Transportation Corp. | 7/1965-10/1966 | | NAKINA |
| 2 | URMX | Union Refrigerator Transit Lines | eliminated 7/1967 | | NAKINA |
| 3 | URMX | Union Refrigerator Transit Lines, a Division of the General American Transportation Corp. | 7/65-10/66 | | NRHS |
| 4 | URMX | Union Refrigerator Transit Lines | eliminated 7/67 | | NRHS |
| 5 | URMX | *UNION REFRIGERATOR TRANSIT LINES, DIV. GENERAL AMERICAN TRANSPORTATION CORP. | | | PWRC |
| 6 | URMX | +UNITRAC RAILROAD MATERIALS INC. | | | PWRC |
| 7 | URMX | UNITRAC RAILROAD MATERIALS INCORPOR | | | SCAC4 |
