Names
- Pere Marquette Railway Company1
- Pere Marquette Railway.1
- Philadelphia, Baltimore and Washington Railroad Company1
- Piper, Horace.1
- Piper, William J.1
- Pitcher, Zina, 1797-1872.1
- Pittsburgh and Lake Erie Railroad Company1
- Pittsburgh, Chartiers and Youghiogheny Railway Company1
- Pittsburgh, Youngstown and Ashtabula Railway Company1
- Platt, Zephaniah, 1797-1872.1
- Polk, James K. (James Knox), 1795-1849.1
- Pomeroy, Austin.1
- Pond, Elihu Bartlit, 1826-1898.1
- Pontiac, Oxford and Northern Railroad Company.1
- Port Huron and North Western Railway Company.1
- Prescott, R. F.1
- Price, Lyman B., 1811-1
- Prichette, Kintzing.1
- Ransom, Epaphroditus, 1797-1859.1
- Redfield, Alexander Heman, 1805-1869.1