I
- Idrac, Anne-Marie (born 1951), RATP, SNCF 2006–present.
- Ingalls, Melville E. (1842–1914), CCC&StL 1889-1905.
- Ingram, John W., RI 1974-1975.
- Insull, Samuel (1859–1938), CNS&M, CA&E, CSS&SB 1925-1933.
- Ives, Brayton C. (born 1841), NP 1893-1896.
Read more about this topic: List Of Railroad Executives