Names
- Pennsylvania-Reading Seashore Lines1
- Pere Marquette Line Steamers.1
- Pere Marquette Railroad Company1
- Pere Marquette Railway Company1
- Pere Marquette Railway.1
- Philadelphia, Baltimore and Washington Railroad Company1
- Pickard, Josiah Little, 1824-1914.1
- Pittsburgh and Lake Erie Railroad Company1
- Pittsburgh, Chartiers and Youghiogheny Railway Company1
- Pittsburgh, Youngstown and Ashtabula Railway Company1
- Pontiac, Oxford and Northern Railroad Company.1
- Port Huron and North Western Railway Company.1
- Pullman Company.1
- Raymond, J. Everett1
- Raymond, J. Everett.1
- Richmond-Washington Company1
- Rio Grande Southern Railroad.1
- Ripley, William Zebina, 1867-1941.1
- Rogers, Henry Wade, 1853-1926.1
- Rosenthal, Lessing, 1868-1949.1