| 1 | TCSX | Transcontinental Systems, Inc. | 4/1970 | | NAKINA |
| 2 | TCSX | Tank Car Services, Inc. | added 1/1980; 1/1980; eliminated 1/1986 | | NAKINA |
| 3 | TCSX | Transcontinental Systems, Inc. | Apr-70 | | NRHS |
| 4 | TCSX | Tank Car Services, Inc. | added 1/80; 1/80; eliminated 1/86 | | NRHS |
| 5 | TCSX | *TRANSCONTINENTAL SYSTEMS, INC. | | | PWRC |
| 6 | TCSX | *TANK CAR SERVICES, INC. | | | PWRC |
| 7 | TCSX | *TRINITY INDUSTRIES [TRANCISCO RAIL SERVICES CO.} | | | PWRC |
| 8 | TCSX | Tank Car Services | | | RSRV |
| 9 | TCSX | TEXAS CRUSHED STONE COMPANY | | | SCAC4 |
