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Classic Streamliners - TRAIN​CYCLOPEDIA

Common Carrier Freight Railroads in the United States - P
About 700 railroads operate common carrier freight service in the United States. There are about 150,000 miles (240,000 km) of railroad track in the United States, nearly all standard gauge.

Reporting marks are listed in parentheses.

Pacific Harbor Line, Inc. (PHL) (ARH)
Pacific Imperial Railroad (PIR)
Pacific Sun Railroad (PSRR) (WATX)
Paducah and Illinois Railroad (PI) (IC) (CN)
Paducah and Louisville Railway (PAL) (PLTX)
Palouse River and Coulee City Railroad (PCC) (WATX)
Pan Am Railways (PAR) (ST)
Pan Am Southern (PAS) (PAR) (ST)
Panhandle Northern Railroad (PNR) (OMLX)
Patriot Woods Railroad (PAWS) (CLC) (PATR)
Pecos Valley Southern Railway (PVS) (WATX)
Pee Dee River Railway (PDRR) (AR)
Pend Oreille Valley Railroad (POVA)
Peninsula Terminal Company (PT)
Pennsylvania and Southern Railway (PSCC) (RCRY)
Pennsylvania Southwestern Railroad (PSWR) (WATX)
Peru Industrial Railroad (PIRR) (IR) (OMLX)
Pickens Railway, Honea Path Division (PKHP)
Pioneer Industrial Railroad (PRY) (PREX)
Pioneer Valley Railroad (PVRR) (PNSY)
Pittsburgh and Ohio Central Railroad (POHC) (OCRS) (GWRR)
Pittsburgh, Allegheny and McKees Rocks Railroad (PAM)
Plainsman Switching Company (PSC)
Plainview Terminal Company (PTM)
Point Comfort and Northern Railway (PCN) (GWRR)
Port Bienville Railroad (PBVR) (HCPHC)
Port Harbor Railroad (PHRR) (RRC)
Port Jersey Railroad (PJR)
Port Manatee Railroad (MAUP)
Port of Beaumont Railroad (PBR)
Port of Catoosa Railroad (PC)
Port of Muskogee Railroad (PMR)
Port of Tucson Railroad (POT)
Port Rail Saint Charles (PRSC)
Port Terminal Railroad Association (PTRA)
Port Terminal Railroad of South Carolina (PTR)
Portland and Western Railroad (PNWR) (GWRR)
Portland Terminal Railroad (PTRC) (BNSF) (UP)
Portland Vancouver Junction Railroad (PVJR) (CBRW)
Prescott and Northwestern Railroad (PNW) (AKMD) (GWRR)
Progressive Rail, Inc. (PGR)
Providence and Worcester Railroad (PW) (GWRR)
Puget Sound and Pacific Railroad (PSAP) (GWRR)

See also:

Railroads of the United States

Heritage Railways