| Abbreviation | Definition |
|---|---|
| PSOX | Puget Sound Power and Light |
| PSOX | Puget Sound Power and Light Company |
| PSPX | Phillips Petroleum |
| PSPX | Phillips Petroleum Company |
| PSR | Pittsburg and Shawmut Railroad |
| PSR | Pittsburg and Shawmut Railroad Incorporated |
| PSTR | Port Stanley Terminal Rail |
| PSTX | Joseph Transportation |
| PT | Peninsula Terminal |
| PT | Peninsula Terminal Company |
| PTC | Philadelphia Transportation Company |
| PTC | Plainview Terminal |
| PTC | Plainview Terminal Company |
| PTDX | ABB Power T and D |
| PTDX | ABB Power T and D Company Incorporated |
| PTE | Passenger Transport Executive |
| PTEG | Passenger Transport Executive Group |
| PTEX | Canpotex |
| PTEX | General Electric Railcar Services Corporation |
| PTIZ | Parkway Transport |