The Rip Track

• Macfarlane, Robert Stetson (born 1899) - President of Northern Pacific Railway 1951-1966.
• Mackenzie, William (1849-1923) - Part owner of Toronto Street Railway, builder of Canadian Northern Railway predecessors.
• Mahone, William (1826-1895) - American civil engineer who built the Norfolk & Petersburg Railroad.
• Mallet, Anatole (1837-1917) - Inventor of the Mallet articulated steam locomotive type.
• Mallory, Francis (1807-1860) - Financier and a founder of the Norfolk & Petersburg Railroad.
• Malmborg, Oscar (1820-1880) - Swedish-born U.S. immigration agent for Illinois Central Railroad 1853-1861.
• Manson, J. - Chief Mechanical Engineer for Great North of Scotland Railway 1883-1890.
• Manvel, Allen (1837-1893) - Succeeded William B. Strong as president of Atchison, Topeka & Santa Fe Railway 1889-1893.
• Manwiller, Michael - Chief mechanical officer for Heber Valley Railroad.
• Marble, John Hobart (1869-1913) - Assistant to Interstate Commerce Commission member Franklin Knight Lane 1906-1912, working his way up from Lane's clerk to be the attorney in charge of all commission prosecutions; appointed secretary to the Interstate Commerce Commision in 1912, becoming a full commissioner on March 10, 1913.
• Marsh, Ernest S. (1903-1975) - President of Atchison, Topeka & Santa Fe Railroad 1957-1966.
• Martin, John - Chairman of the United States Senate Committee on Railroads 1894-1895.
• Massey, William (1856-1925) - New Zealand Minister of Railways 1919-1922.
• Maunsell, Richard (1868-1944) - Chief Mechanical Engineer for South Eastern and Chatham Railway 1913-1923 and Southern Railway in England 1923-1937.
• Mayon, E. J. - President of the Order of Railway Telegraphers.
• William Gibbs McAdoo, 1914
  McAdoo, William Gibbs (1863-1941) - Worked to electrify the Knoxville Street Railroad, involved in the Battle of Depot Street over streetcar line construction; president of Hudson & Manhattan Railroad Co. where he oversaw completion in 1908 of trans-Hudson railway tunnels that were begun by Dewitt Clinton Hasin in the 1880s (tunnels that are still in use by PATH).
• McAlpine, John K. (1906-1984) - New Zealand Minister of Railways 1954-1957 and 1960-1966.
• McDonnell, A. - Chief Mechanical Engineer for North Eastern Railway 1882-1885.
• McGuigan, Thomas M. (born 1921) - New Zealand Minister of Railways 1972-1974.
• McIlhon, C. W. - President of the Mineral Point & Northern Railway.
• McKenzie, William Innes - Builder of extensions to the Toronto, Grey & Bruce Railway in Canada.
• McKinley, William B. (1856-1926) - Founder and president of Illinois Railway & Light Company 1900-1904; continued as president after its reorganization as the Illinois Traction Company 1904-1922.
• McLachlan, Colin (1924-1985) - New Zealand Minister of Railways 1975-1981.
• Meiggs, Henry (1811-1877) - American promoter and con-man who worked to build the original railway lines in Peru and the line connecting Santiago and Valparaiso, Chile.
• Mellen, Charles Sanger (1852-1927) - President of Northern Pacific Railway 1897-1903; president of New Haven Railroad 1903-1913; president of Maine Central Railroad 1910-1914.
• Melnikov, Pavel Petrovich (1804-1880) - Russian engineer and Transport Minister responsible for the selection of 5 ft gauge as the standard for Russian railways.
• Menk, Louis W. - President of Burlington Northern Railroad 1970-__.
• Meyer, Jean Jacques (1804-1877) - French steam locomotive builder and designer of the Meyer articulation type.
• Millar, John A. (1855-1915) - New Zealand Minister of Railways 1908-1912.
• Miller, Dennis H. - President of Iowa Interstate Railroad 2004-__.
• Mills, Frederick  (1898-1949) - Chief mechanical engineer of Western Australian Government Railways 1940-1949.
• Missenden, Eustace (1886-1973) - General manager of Southern Railway (UK) 1941-1947; chairman of the Railway Executive 1947-1951.
• Mitchell, Alexander (1817-1887) - President of Chicago, Milwaukee & St. Paul Railroad 1864-1887.
• Mitchell, John H. (1835-1905) - Chairman of the United States Senate Committee on Railroads 1877-1879 and 1889-1891.
• Moffat, David (1839-1911) - Colorado financier and head of nine railroads; namesake of Moffat Tunnel.
• Molson, John (1763-1836) - Founder of the Champlain & St. Lawrence Railroad, the first railroad in Canada.
• Moohan, Michael (1899-1967) - New Zealand Minister of Railways 1957-1960.
• Moore, Margaret Landry (1923-2005) - "Miss Southern Belle" spokesmodel for Kansas City Southern's Southern Belle passenger trains.
• Moorsom, Constantine Richard (1792-1861) - Director for the London & Birmingham Railway 1837-1839; Chairman of the Board for the Birmingham & Gloucester Railway 1841-1843; Chairman of the London & North Western Railway 1852-1861.
• Moorsom, William (1804-1863) - Chief engineer for the Cromford & High Peak Railway 1830-1832; chief engineer for the Birmingham & Gloucester Railway 1836-__ during which time he oversaw the construction of the Lickey Incline; consulting engineer in 1843 on a new line for the Königlich Preußische und Großherzoglich Hessische Staatseisenbahn in Prussia; consulting engineer in 1845 for the Waterford & Kilkenny Railway in Ireland; consulting engineer in 1847 for the Southampton & Dorchester Railway; consulting engineer in 1856 for a railway connecting Kandy and Colombo in Ceylon; consulting engineer in 1862 for the Ringwood, Christchurch & Bournemouth Railway.
• Morgan, Charles Langbridge (1855-1940) - Deputy Director of Railways for the British Army during World War I.
• Morgan, John Pierpont (1837-1913) - Usually known as J. P. Morgan; American financier who fought with Jay Gould and Jim Fisk for control of several eastern US railroads.
• Morrill, Anson Peaslee (1803-1887) - President of Maine Central Railroad 1864-1866 and 1873-1875, then vice president of same 1875-1887.
• Morris, Thomas A. (1811-1904) - Supervising engineer for the Madison & Indianapolis Railroad; president of the Bee Line and the Indianapolis & Cincinnati Railroad.
• Morrison, William Ralls (1824-1909) - Member of the Interstate Commerce Commission 1887-1892; Chairman of the ICC 1892-1897.
• Morse, Ephraim (1823-1906) - Organized the San Diego & Gila Railroad in 1879; worked to convince the California Southern Railroad to establish its coastal endpoint in San Diego.
• Myers, Arthur (1868-1926) - New Zealand Minister of Railways 1912.

Photo credits

• William Gibbs McAdoo - Official portrait by Harris & Ewing as U.S. Secretary of the Treasury. The Wikimedia Commons description page for this image (retrieved December 6, 2011) asserts that the image is in the public domain because it was published in the U.S. before 1923.