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- Kakiuchi, Takeshi, JR West -2005.
- Kalikow, Peter S. (born 1943), NYMTA 2001–present.
- Kamarás, Miklós, MÁV -2008.
- Kasyanov, Alexander, East Siberian Railway -2004.
- Kawamura, Takeji, South Manchuria Railway 1922-1924.
- Keddi, Herbert, DR 1989-1990.
- Keep, Albert (1826–1907), CNW, LSMS.
- Kenefick, John, UP 1971–1986.
- Kenny, Raymond P., LIRR 2006-2007.
- Keyes, Henry (1810–1870), ATSF 1869–1870.
- Kidde, Walter (1877–1943), NYSW 1937-1943.
- Kidder, John Flint (died 1901), NCNG -1901.
- Kidder, Sarah, NCNG 1901-1913.
- Kilbourn, Byron (1801–1870), Milwaukee and Mississippi Railroad 1849-1852.
- Kiley, John P., MILW -1957.
- Kimball, Benjamin, CS 1880.
- Kimball, Frederick J. (1844–1903), N&W 1881-1903.
- Kimmel, William (1812–1886), B&O.
- King, James Gore (1791–1853), Erie 1835–1839.
- King, John, Erie 1884-1894.
- Kittson, Norman (1814–1888), SPM&M 1879-.
- Klemm, Hans, DR 1990-1991.
- Knott, Stuart R. (1859–1943), KCS 1900-1905.
- Kohiyama, Naoto, South Manchuria Railway 1943-1945.
- Kramer, Erwin, DR 1950-1970.
- Krebs, Robert, SP 1982–1984, BNSF.
- Kreikemeyer, Willi, DR 1949-1950.
- Kruttschnitt, Julius, SP 1913-1925.
- Kummant, Alexander (born 1942), Amtrak 2006-2008.
- Kunisawa, Simbei, South Manchuria Railway 1917-1919.
Read more about this topic: List Of Railroad Executives