| 1 | PGSX | Apex Tank Car Line | added 4/1963; 7/1965-1/1975; eliminated 10/1976; 1/1980 | | NAKINA |
| 2 | PGSX | Propane Gas Service, Inc. | 1/1952-4/1961; eliminated 4/1963 | | NAKINA |
| 3 | PGSX | Propane Gas Service, Inc. | 1/52-4/61 | | NRHS |
| 4 | PGSX | Apex Tank Car Line | 7/65-1/80 | | NRHS |
| 5 | PGSX | *PROPANE GAS SERVICE, INC. | | | PWRC |
| 6 | PGSX | *APEX TANK CAR LINE | | | PWRC |
| 7 | PGSX | *PROGRESSIVE RAIL, INC. | | | PWRC |
