| Abbreviation | Definition |
|---|---|
| JNSX | JNS Marketing Company Coastline Rail Service Division |
| JNTX | John Neas Tank Lines |
| JOBX | Tealinc |
| JOL | Joilet Station (METRA- AMTK) |
| JORX | Jormac de CV |
| JORX | Jormac, S. A. de C. V. |
| JOSX | David J. Joseph Transportation |
| JOTU | Japan Oil Transportation |
| JOTU | Japan Oil Transportation Company Limited |
| JPBX | Peninsula Corridor Joint Powers Board (Caltrain) |
| JPTU | Daikin Industries |
| JR | Japan Rail |
| JRA | Joint Rail Authority |
| JRCX | GLNX Corporation |
| JRSX | J. R. Simplot |
| JRSX | J. R. Simplot Company |
| JRWX | Johnson Railway Service |
| JRX | Japanese Rail X |
| JSCU | Flexi-Van Leasing |
| JSCU | Flexi-Van Leasing Incorporated |