List of reporting marks: P

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 Company
 * PARY - Prairie Trunk Railway
 * PAS - Pan Am Southern
 * PAUT - Pennsylvania and Atlantic Railroad; Conrail
 * PAXX - Passenger Railcar Services Corporation
 * 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
 * PBRR - Prairie Belt Railroad
 * PBVR - Port Bienville Railroad
 * PC  - Penn Central; Norfolk Southern
 * PCA - Penn Central; Norfolk Southern
 * PCB - Penn Central; Norfolk Southern
 * 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
 * PCRC - Panama Canal Railway Company; Kansas City Southern 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 - Procter 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 - Procter 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
 * PINX - Pinnacle Polymers
 * 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.
 * PLLU - Polynesia Line
 * PLLZ - Polynesia Line
 * PLMX - PLM International
 * PLWX - GE Capital Railcar Services
 * PM  - Pere Marquette Railway; Chesapeake and Ohio Railway; Chessie System; CSX Transportation
 * PMLX - Prairie Malt, Ltd.
 * PMRX - Progress Metal Reclamation Company
 * PN - Piedmont and Northern Railway; Seaboard Coast Line; CSX Transportation
 * PN - Pennsylvania Northeastern Railroad
 * PNRW - Piedmont and Northern Railway (division of Patriot Rail Corporation)
 * PNWR - Portland and Western Railroad
 * PNWX - PNW Railcars, Inc.
 * POHC - Pittsburgh and Ohio Central Railroad
 * POTB - Port of Tillamook Bay 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
 * PRCX - 20th Century Fox
 * PRGX - ProGold, LLC
 * PRL - Penn Eastern Rail Lines, Inc.; East Penn Railway
 * PRLX - Progress Rail Services Corporation
 * PRMU - Puerto Rican Maritime Shipping Authority
 * PROX - Procor
 * PRR - Pennsylvania Railroad; Penn Central; Norfolk Southern
 * PRRX - Norfolk Southern
 * PRSL - Pennsylvania-Reading Seashore Lines; Norfolk Southern
 * PRSX - Progress Rail Services Corporation
 * PS  - Pittsburg and Shawmut Railroad
 * PSCX - Public Service Company of Colorado
 * PSL - Peabody Short Line; Illinois Central Railroad; Canadian National Railways
 * PSPX - Phillips Petroleum Company
 * PSR - Pittsburg and Shawmut Railroad
 * PTM  - Portland Terminal Company; Maine Central Railroad; Pan Am Railways
 * PTEX - Canpotex
 * PTLX - Pullman Transport Leasing; GE Rail Services
 * PW  - Providence and Worcester Railroad