| 1 | SSMX | Southwestern Sugar & Molasses Co. | 1/1943 (not listed); 1/1945-4/1961; eliminated 10/1963 | | NAKINA |
| 2 | SSMX | Southwestern Sugar & Molasses Co., Division of National Molasses Co. | added 10/1963; eliminated 10/1964 | | NAKINA |
| 3 | SSMX | National Molasses Co. | added 10/1964; 7/1965-1/1975; eliminated 4/1975 | | NAKINA |
| 4 | SSMX | The David J. Joseph Co. | added 4/1990; 1/1994; eliminated 4/2000 | | NAKINA |
| 5 | SSMX | Joseph Transportation Inc. | added 4/2000; 7/2000; eliminated 10/2003 | | NAKINA |
| 6 | SSMX | The David J. Joseph Co. | added 10/2003; 7/2005; eliminated 1/2009 | | NAKINA |
| 7 | SSMX | Southwestern Sugar & Molasses Co. | 1/52-4/61 | | NRHS |
| 8 | SSMX | National Molasses Co. | 7/65-1/75; eliminated 4/75 | | NRHS |
| 9 | SSMX | The David J. Joseph Co. | added 4/90; 1/94; eliminated 4/2000 | | NRHS |
| 10 | SSMX | Joseph Transportation Inc. | added 4/2000; 7/2000 | | NRHS |
| 11 | SSMX | *NATIONAL MOLASSES CO. [SOUTHWESTERN SUGAR & MOLASSES CO.] | | | PWRC |
| 12 | SSMX | +DAVID J. JOSEPH COMPANY ([JOSEPH TRANSPORTATION, INC.) | | | PWRC |
| 13 | SSMX | Joseph Transportation | | | RSRV |