| Railroad | Records | Links |
|---|
| Totals | 25,132 | 858 |
|---|
| Pacific and Arctic Railway and Navigation Company | 10 | |
| Pacific and Idaho Northern Railway | 7 | |
| Pacific Coast Railway Company | 18 | |
| Pacific Lumber Company Railroad | 5 | |
| Paducah Tennessee and Alabama Railroad | 5 | |
| Pajaro Valley Consolidated Railroad | 5 | |
| Panama Railway | 37 | 4 |
| Paragould Southeastern Railway | 6 | |
| Passumpic Railroad | | 1 |
| Paterson and Hudson River Railroad | | 1 |
| Pawnee Railroad | 6 | |
| Pearl and Leaf River Railroad | 6 | |
| Pecos Valley and Northeastern Railway | 11 | |
| Pecos Valley Railway | 5 | |
| Pemberton and Hightstown Railroad | 6 | |
| Pendleton Railroad | 14 | |
| Peninsular Railway | 5 | |
| Pennsboro and Harrisville Railway | 2 | |
| Pennsylvania Coal Co Railroad | 13 | |
| Pennsylvania Railroad | 370 | 14 |
| Pensacola and Andalusia Railroad | 6 | |
| Pensacola, Alabama and Tennessee Railroad | 3 | |
| Peoples Railway | 3 | |
| Peoria and Bureau Valley Railroad | 13 | 1 |
| Peoria and Pekin Terminal Railway | 10 | |
| Peoria and Pekin Union Railway | 18 | |
| Peoria and Rock Island Railroad | 16 | |
| Peoria and Springfield Railway | 2 | |
| Peoria Decatur and Evansville Railroad | 14 | 2 |
| Peoria, Pekin and Jacksonville Railroad | 4 | |
| Pere Marquette Railroad | 18 | |
| Perkiomen Railroad | 10 | |
| Perris and Lake View Railroad | 2 | |
| Perry County Railroad | 9 | |
| Peru and Indianapoliis Railroad | 20 | |
| Petersburg Railroad | 16 | |
| Philadelphia and Baltimore Central Railroad | 34 | 1 |
| Philadelphia and Brigantine Railroad | 5 | |
| Philadelphia and Erie Railroad | 49 | 3 |
| Philadelphia and Reading Railroad | 163 | 5 |
| Philadelphia and Sunbury Railroad | 10 | |
| Philadelphia and Trenton Railroad | 26 | 1 |
| Philadelphia Baltimore & Washington Railroad | 1 | 1 |
| Philadelphia Belt Line Railroad | 5 | |
| Philadelphia, Germantown and Norristown Railroad | 49 | 1 |
| Philadelphia, Newtown and New York Railroad | 7 | |
| Philadelphia, Wilmington and Baltimore Railroad | 83 | 6 |
| Phillips and Rangeley Railroad | 5 | |
| Phllipsburg Railway and Quarry Company | 3 | |
| Pickens and Addison Railroad | 5 | |
| Pickens Railroad | 6 | |
| Pine Bluff and Western Railway | 4 | |
| Pine Bluff Arkansas River Railway | 4 | |
| Pinehurst Railroad | 5 | |
| Pittsburgh and Castle Shannon Railroad | 12 | |
| Pittsburgh and Connellsville Railroad | 45 | 1 |
| Pittsburgh and Eastern Railroad | 3 | 1 |
| Pittsburgh and Lake Erie Railroad | 33 | 2 |
| Pittsburgh and Moon Run Railroad | 9 | |
| Pittsburgh and Ohio Valley Railway | 10 | |
| Pittsburgh and Steubenville Railroad | 18 | |
| Pittsburgh and Western Railroad | 18 | 1 |
| Pittsburgh, Akron and Western Railroad | 7 | |
| Pittsburgh, Allegheny and McKees Rocks Railroad | 9 | |
| Pittsburgh, Chartiers and Youghiogheny Railway | 5 | 1 |
| Pittsburgh, Cincinnati and St Louis Railway | 58 | 1 |
| Pittsburgh, Cincinnati, Chicago and St Louis Railway | 51 | |
| Pittsburgh, Columbus and Cincinnati Railroad | 5 | |
| Pittsburgh, Fort Wayne and Chicago Railroad | 29 | |
| Pittsburgh, Fort Wayne and Chicago Railway | 40 | 1 |
| Pittsburgh, Johnstown and Eastern Railroad | 5 | |
| Pittsburgh, Lisbon and Western Railway | 8 | |
| Pittsburgh, Marion and Chicago Railway | 6 | |
| Pittsburgh, Shawmut and Northern Railroad | 10 | |
| Pittsburgh, Shenango and Lake Erie Railroad | 8 | |
| Pittsburgh, Westmoreland and Somerset Railroad | 10 | |
| Plattsburgh and Montreal Railroad | 25 | |
| Ponchartrain Railroad | 13 | |
| Pontiac, Oxford and Northern Railroad | 9 | |
| Port Huron Southern Railroad | 5 | |
| Port Jervis, Monticello and New York Railroad | 2 | |
| Port Royal and Augusta Railroad | 6 | |
| Port Townsend Southern Railroad | 2 | |
| Porters Creek and Gauley Railroad | 5 | |
| Portland and Eastern Railroad | 3 | |
| Portland and Kennebec Railroad | 20 | |
| Portland and Ogdensburg Railroad | 7 | 1 |
| Portland and Oxford Central Railroad | 9 | |
| Portland and Rochester Railroad | 18 | |
| Portland and Rumford Falls Railway | 8 | |
| Portland Railroad | 6 | |
| Portland, Saco and Portsmouth Railroad | 25 | |
| Portsmouth and Concord Railroad | 29 | 1 |
| Portsmouth and Roanoke Railroad | | 1 |
| Portsmouth and Tygart Valley Railroad | 6 | |
| Portsmouth, Great Falls and Conway Railroad | 11 | |
| Potomac, Fredericksburg and Piedmont Railroad | 5 | |
| Potsdam and Watertown Railroad | 19 | |
| Poughkeepsie and Eastern Railway | 15 | 2 |
| Prairie du Chien and La Crosse Railroad | 16 | |
| Prescott and Northwestern Railway | 8 | |
| Providence and Boston Railroad | | 1 |
| Providence and Springfield Railroad | 4 | |
| Providence and Worcester Railroad | 39 | |
| Providence, Warren and Bristol Railroad | 28 | |
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