Liste des sigles de l'AAR débutant par P
Pour un article plus général, voir Sigle de l'AAR.
P
- PACY - Prairie Central Railway
- PAE - Peoria and Eastern Railway ; Conrail
- PAL - Paducah and Louisville Railway
- PAM - Pittsburgh, Allegheny and McKees Rocks Railroad
- PARX - Pan American Railway
- PARY - Prairie Trunk Railway
- PAUT - Pennsylvania and Atlantic Railroad ; Conrail
- PBFX - IBP, Inc. ; Tyson Foods
- PBL - Philadelphia Belt Line Railroad
- PBLX - Pillsbury
- PBNE - Philadelphia, Bethlehem and New England Railroad
- PBR - Patapsco and Back Rivers Railroad
- PBVR - Port Bienville Railroad
- PC - Penn Central; Conrail
- PCA - Penn Central ; Conrail
- PCB - Penn Central ; Conrail
- PCCX - Peabody Coal Company
- PCEX - GE Rail Services
- PCFX - Pacific Car and Foundry Company
- PCIX - Shippers Car Line ; ACF Industries
- PCMX - Petro-Chem Marketing Company
- PCN - Point Comfort and Northern Railway
- PCSX - GE Rail Services
- PCTX - Pioneer Cement Company of Texas
- PCY - Pittsburgh, Chartiers and Youghiogheny Railway
- PDQX - Castle Capital Corporation
- PE - Pacific Electric Railway ; Conrail
- PECX - Pekin Energy Company
- PENX - Penford Products Company
- PEPX - Potomac Electric Power Company
- PER - Port Everglades Railway
- PF - Pioneer and Fayette Railroad
- PFE - Pacific Fruit Express ; Union Pacific Railroad
- PFM - Power, Fluid & Metals
- PGDX - Proctor and Gamble Manufacturing Company
- PGE - Pacific Great Eastern Railway ; British Columbia Railway ; Canadian National Railway
- PGER - Pacific Great Eastern Railway ; British Columbia Railway ; Canadian National Railway
- PGEX - Portland General Electric Company
- PGHX - Trinity Rail Management, Inc.
- PGMX - Proctor and Gamble Manufacturing Company
- PGR - Progressive Rail
- PHCR - Port Colborne Harbour Railway
- PHD - Port Huron and Detroit Railroad ; Chessie System ; CSX Transportation
- PHL - Pacific Harbor Line
- PI - Paducah and Illinois Railroad
- PICK - Pickens Railroad
- PJR - Port Jersey Railroad
- PLCX - Pullman Leasing Company ; GE Capital Railcar Services
- PLE - Pittsburgh and Lake Erie Railroad ; New York Central Railroad ; Penn Central ; Conrail ; CSX Transportation (after Conrail breakup)
- PLEX - PLM, Inc.
- PLMX - PLM International
- PLWX - GE Capital Railcar Services
- PM - Pere Marquette Railway ; Chesapeake and Ohio Railway ; Chessie System ; CSX Transportation
- PMLX - Prairie Malt, Ltd.
- PNWR - Portland and Western Railroad
- POHC - Pittsburgh and Ohio Central Railroad
- PPAX - PCS Phosphate Company
- PPCX - American Association of Private Railroad Car Owners
- PPGX - PPG Industries, Inc.
- PPHX - PCS Phosphate Company
- PPLX - Pennsylvania Power and Light Company
- PPNX - PCS Phosphate Company
- PPRX - Phillips Petroleum Company
- PPU - Peoria and Pekin Union Railway
- PRGX - ProGold, LLC
- PRL - Penn Eastern Rail Lines Inc. ; East Penn Railway
- PROX - Procor
- PRR - Pennsylvania Railroad ; Penn Central ; Conrail; Norfolk Southern (after Conrail breakup)
- PRSL - Pennsylvania-Reading Seashore Lines
- PS - Pittsburg and Shawmut Railroad
- PSL - Peabody Short Line ; Illinois Central Railroad ; Canadian National Railways
- PSPX - Phillips Petroleum Company
- PSR - Pittsburg and Shawmut Railroad
- PTEX - Canpotex
- PW - Providence and Worcester Railroad
- Portail du chemin de fer
- Portail de l’Amérique