| Abbreviation | Definition |
|---|---|
| PDIZ | Produce Distributors Incorporated |
| PDLHL | Port Dover & Lake Huron Railway |
| PDQX | Castle Capital Corporation |
| PDRR | Pee Dee River Railroad Corporation |
| PDWR | Port Arthur, Duluth, & Western Railway |
| PE | Consolidated Rail Corporation |
| PE | Pacific Electric Railway (Conrail) |
| PECR | Prince Edward County Railway |
| PECX | General Electric Railcar Services Corporation |
| PECX | Pekin Energy |
| PELX | Premier Equipment Leasing |
| PELX | Premier Equipment Leasing Company |
| PELZ | Premier Equipment Leasing |
| PELZ | Premier Equipment Leasing Incorporated |
| PENX | Penford Products |
| PENX | Penford Products Company |
| PEPX | Potomac Electric Power |
| PEPX | Potomac Electric Power Company |
| PER | Port Everglades Railway |
| PERU | Maxu Containers Limited |