- Page, William N. (1854-1924) - American civil engineer who built the Chesapeake & Ohio Railway and the Virginian Railway.
- Palmer, William Jackson (1836-1909) - Builder of the Denver & Rio Grande Western Railroad.
- Payne, Henry C. (1843-1904) - President of Milwaukee & Northern Railroad, president of Milwaukee Electric Railway & Light Company, president of Milwaukee & Cream City Traction Company, president of American Street Railway Association in 1893, appointed receiver for Northern Pacific Railway in August 1893.
- Pease, Edward (1767-1858) - First owner of the Stockton & Darlington Railway.
- Pelletier, Jean (1935-2009) - Chairman of VIA Rail 2001-2004.
- Pelley, J. J. - President of the Association of American Railroads. (Palmer 1942)
- Perben, Dominique (born 1945) - Minister of Transportation for France 2005-2007.
- Perris, Fred T. - (1836-1916) Chief engineer of the California Southern Railroad, a subsidiary of the Santa Fe that built the route through Cajon Pass. (Serpico 1988)
- Pickersgill, W. - Chief Mechanical Engineer for Great North of Scotland Railway 1894-1914.
- Plant, Henry B. (1819-1899) - President of the Plant System.
- Pollitt, H. - Chief Mechanical Engineer for Great Central Railway 1897-1900.
- Pomeroy, Samuel C. (1816-1891) - President of Atchison, Topeka & Santa Fe Railway 1863-1868.
- Porter, Henry Kirke (1840-1921) - Founder of H. K. Porter, Inc., locomotive manufacturing company.
- Posner, Henry, III - Conrail. (Trains, June 1991, p 18)
- Porta, Livio Dante (1922-2003) - Argentinian steam locomotive mechanical engineer.
- Pullman, George M. (1831-1897) - Founder of Pullman Palace Car Company.
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