| Train Name | Railroad | Train Endpoints in a typical [year] | Operated |
|---|
| Mackinaw Island Express | Detroit and Mackinac Railway, Michigan Central Railroad | Detroit, Michigan – Alpena, Michigan [1930] | 1919-1935 |
| Mahaiwe | New Haven Railroad | New York, New York – Pittsfield, Massachusetts [1960] | 1956-1960 |
| Mahkeenac | New Haven Railroad | New York, New York – Pittsfield, Massachusetts [1960] | 1954-1960 |
| Mail and Express | Missouri-Kansas-Texas | Kansas City, Missouri – Dallas, Texas [1916] | 1903-1911; 1915-1916; 1920 |
| Mail and Express | Texas Midland Railroad | Paris, Texas – Ennis, Texas (with through cars to Galveston) [1903] | 1902-1911 |
| Mail and Express | Wabash Railroad | St. Louis, Missouri – Toledo, Ohio [1910] | 1909-1915 |
| Mail and Express | Pennsylvania Railroad | New York, New York – Pittsburgh, Pennsylvania [1953] | 1951-1961 |
| Mail Express | Amtrak | Washington, DC – Boston, Massachusetts [1985] | 1984-1990 |
| Main Line Express | Pennsylvania Railroad | Philadelphia, Pennsylvania – Pittsburgh, Pennsylvania [1925] | 1893-1930 |
| Maine Coast Special | Canadian National | Montreal, Quebec – Berlin, New Hampshire -- Portland, Maine [1938] | c.1938 |
| Mainstreeter | Northern Pacific, Chicago, Burlington and Quincy Railroad, Spokane, Portland and Seattle Railway (1952–1970);
Burlington Northern (1970–1971) | Chicago, Illinois – Seattle, Washington (1952–1970);
St. Paul, Minnesota – Seattle, Washington (1970–1971) | 1952-1971 |
| Major | Lehigh Valley Railroad | New York, New York – Buffalo, New York [1955] | 1954-1958 |
| Man O' War | Central of Georgia | Atlanta, Georgia – Columbus, Georgia [1953] | 1947-1971 |
| Manhattan | Amtrak | Washington, DC – New York, New York [1991] | 1991 |
| Manhattan Limited | Pennsylvania Railroad, Penn Central | Chicago, Illinois – New York, New York [1958] | 1903-1971 |
| Manhattan Limited | Amtrak | New York, New York – Philadelphia, Pennsylvania [1982] | 1981-1984 |
| Manitoba Express | Minneapolis, St. Paul and Sault Ste. Marie Railway and
Canadian Pacific Railway | St. Paul, Minnesota – Winnipeg, Manitoba [1905] | 1904-1918 |
| Manitoba Limited | Northern Pacific Railway | St. Paul, Minnesota – Winnipeg, Manitoba [1930] | 1914-1915, 1921-1946 |
| Maple Leaf [2] | Grand Trunk Western Railroad and
Canadian National | Chicago, Illinois (Dearborn Station) – Toronto, Ontario – Montreal, Quebec (with through cars to New York) [1938] | 1927-1971 |
| Maple Leaf | Via/Amtrak | New York, New York – Toronto, Ontario [1985] | 1981–present |
| Maple Leaf | Lehigh Valley, Reading Company
Canadian National | New York, New York – Philadelphia, Pennsylvania – Toronto, Ontario [1940] | 1937-1961 |
| Marathon | Missouri Pacific | Kansas City, Missouri – Omaha, Nebraska [1935] | 1935-1939 |
| Mariner | Pennsylvania Railroad | Philadelphia, Pennsylvania – Cape Charles, Virginia [1944] | 1944-1947 |
| Mark Twain Zephyr | Chicago, Burlington & Quincy | St. Louis, Missouri – Burlington, Iowa [1948] | 1936-1952 |
| Marquette | Milwaukee Road | Chicago, Illinois – Mason City, Iowa [1940] | 1938-1950 |
| Marquette | Pere Marquette | Chicago, Illinois – Grand Rapids, Michigan | |
| Marquette | Amtrak | Chicago, Illinois – Milwaukee, Wisconsin [1982] | 1980-1983 |
| Marylander | Baltimore and Ohio Railroad,
Reading Railroad, and
Central Railroad of New Jersey | Washington, DC – Jersey City, New Jersey [1940] | 1938-1956 |
| Matinee | New York, Susquehanna and Western Railway | New York, New York – Paterson, New Jersey [1953] | 1950-1957 |
| Maumee | New York Central | Chicago, Illinois – Toledo, Ohio (with through cars to other points) [1930] | 1928-1948 |
| Mayflower | New York, New Haven and Hartford Railroad | Boston, Massachusetts – New York, New York [1954] | 1906-1907; 1925-1948; 1952-1968 |
| Mayflower | Amtrak | Washington, DC – Boston, Massachusetts [1995] | 1974; 1992-1998 |
| Meadowlark | Chicago & Eastern Illinois | Chicago, Illinois – Cypress, Illinois [1950] | 1946-1962 |
| Memphian | St. Louis-San Francisco | St. Louis, Missouri – Birmingham, Alabama (endpoints varied widely by year) [1952] | 1923-1958 |
| Memphis and New Orleans Limited | Illinois Central | Cincinnati, Ohio – New Orleans, Louisiana (with sleeping cars to the west coast) [1903] | 1902-1910 |
| Memphis Express | St. Louis-San Francisco | St. Louis, Missouri – Memphis, Tennessee [1907] | 1906-1908; 1917-1921; 1925 |
| Memphis Mail | Chicago, Rock Island and Pacific Railroad | Memphis, Tennessee – Amarillo, Texas [1921] | 1906-1910; 1921-1924 |
| Memphis Special | Pennsylvania Railroad, Norfolk and Western Railway, Southern Railway | New York, New York – Memphis, Tennessee [1938] | 1909-1941 |
| Memphis-Atlanta Express | St. Louis-San Francisco, Southern Railway | Memphis, Tennessee – Atlanta, Georgia [1920] | 1917-1924; 1933-1935 |
| Memphis-Californian | Rock Island, Southern Pacific | Memphis, Tennessee – Los Angeles, California [1948] | 1923-1949 |
| Memphis, Nashville and New Orleans Express | Illinois Central, Nashville, Chattanooga and St. Louis Railway | St. Louis, Missouri – Nashville, Tennessee – New Orleans, Louisiana [1903] | 1902-1910 |
| Mercantile Express | Pennsylvania Railroad | New York, New York – Washington, DC – Cleveland, Ohio – Chicago, Illinois [1930] | 1913-1942 |
| Merchants Express | Delaware, Lackawanna and Western Railroad | Hoboken, New Jersey – Scranton, Pennsylvania [1948] | 1937-1959 |
| Merchants Limited | New York, New Haven and Hartford Railroad (to 1969), Penn Central (1969-1971), Amtrak (from 1971) | New York, New York – Boston, Massachusetts | 1903-1998 |
| Mercury | New York Central | Detroit, Michigan – Cleveland, Ohio (1936–1939) [1938]
Detroit, Michigan – Chicago, Illinois (1939–1949) [1944] | 1936-1949 |
| Meteor | St. Louis-San Francisco Railway | St. Louis, Missouri – Oklahoma City, Oklahoma [1948] | 1902-1965 |
| Meteor | San Francisco - Sacramento Railroad | San Francisco, California – Chico, California [1924] | 1924-1927 |
| Metroliner (type of train) | Penn Central (1968–1971)
Amtrak (1971–2006) | New York, New York – Washington, DC | 1968-2006 |
| Metropolitan | New York Central | New York, New York – Boston, Massachusetts – Chicago, Illinois [1907] | 1905-1928 |
| Metropolitan | Amtrak | New York, New York – Washington, DC [1981] | 1981-1982 |
| Metropolitan Express | Pennsylvania Railroad | Chicago, Illinois – New York, New York [1913] | 1913-1925 |
| Metropolitan Express | Baltimore and Ohio Railroad | Jersey City, New Jersey – St. Louis, Missouri [1908] | 1905-1916 |
| Metropolitan Special | Baltimore and Ohio Railroad | Washington, DC – St. Louis, Missouri [1952] | 1919-1971 |
| Mexico Express | Santa Fe | Albuquerque, New Mexico – El Paso, Texas [1920] | 1906-1932 |
| Mexico Limited | Missouri Pacific Railroad | St. Louis, Missouri – San Antonio, Texas (with through cars to Mexico) [1924] | 1923-1927 |
| Miamian | Pennsylvania Railroad, Richmond, Fredericksburg and Potomac Railroad, Atlantic Coast Line Railroad, Florida East Coast Railway | New York, New York – Miami, Florida [1941] | 1927-1941; 1946-1962 |
| Michigan | New York Central | Chicago, Illinois – Detroit, Michigan [1953] | 1937-1938; 1946-1967 |
| Michigan | Canadian Pacific Railway, New York Central Railroad | Chicago, Illinois – Toronto, Ontario [1934] | 1928-1957 |
| Michigan Central Limited | Michigan Central | New York, New York – Chicago, Illinois [1922] | 1905-1923 |
| Michigan Executive | Amtrak | Detroit, Michigan – Jackson, Michigan [1980] | 1975-1983 |
| Michican Express | Cleveland, Cincinnati, Chicago and St. Louis Railway | Detroit, Michigan – Cincinnati, Ohio [1927] | 1915-1928; 1939-1941 |
| Michigan Express | Pere Marquette Railway | Chicago, Illinois – Traverse City, Michigan [1920] | 1920-1926 |
| Michigan Special | New York Central | Detroit, Michigan – Cincinnati, Ohio [1933] | 1930-1958 |
| Michigan Wolverine | New York Central and its affiliates | Chicago, Illinois – New York, New York (with through cars to many other points) [1924] | 1923-1928 |
| Mid-American | Illinois Central | Chicago, Illinois – St. Louis, Missouri – Memphis, Tennessee [1970] | 1968-1971 |
| Mid-City Express | Pennsylvania and Wabash | Chicago, Illinois – Detroit, Michigan [1940] | 1935-1949 |
| Mid-Continent Special | Chicago, Rock Island and Pacific Railroad | Minneapolis–Saint Paul – Kansas City, Missouri [1948] | 1925-1954 |
| Mid-Day Limited | Cleveland, Cincinnati, Chicago and St. Louis Railway | New York, New York – Cincinnati, Ohio [1913] | 1910-1920 |
| Mid-West Limited | Chesapeake and Ohio Railway, Cleveland, Cincinnati, Chicago and St. Louis Railway | Washington, DC – St. Louis, Missouri [1925] | 1923-1928 |
| Midday Congressional | Pennsylvania Railroad | New York, New York – Washington, DC [1961] | 1956-1971 |
| Midday Keystone | Pennsylvania Railroad | New York, New York – Washington, DC [1956] | 1956-1958 |
| Middle West Express | Baltimore and Ohio Railroad | Jersey City, New Jersey – Chicago, Illinois [1922] | 1917-1930 |
| Midlander | Erie | Chicago, Illinois – Jersey City, New Jersey [1942] | 1939-1947 |
| Midnight | Wabash Railroad | Chicago, Illinois – St. Louis, Missouri [1945] | 1942-1960 |
| Midnight Express | New York Central | New York, New York – Albany, New York – Plattsburgh, New York (different endpoints in different years) [1916] | 1893-1925 |
| Midnight Express | New York, New Haven and Hartford Railroad | New York, New York – Boston, Massachusetts [1914] | 1891-1897; 1905-1918 |
| Midnight Express | Reading Railroad, Delaware, Lackawanna and Western Railroad | Philadelphia, Pennsylvania – Binghamton, New York [1924] | 1923-1928 |
| Midnight Keystone | Pennsylvania Railroad | New York, New York – Washington, DC [1956] | 1956-1959 |
| Midnight Limited (train) | Wabash Railroad | St. Louis, Missouri – Kansas City, Missouri [1955] | 1908-1914; 1927; 1937-1960 |
| Midnight Special | Chicago & Alton,
from 1947 Gulf, Mobile & Ohio | Chicago, Illinois – St. Louis, Missouri [1955] | 1901-1971 |
| Midnight Special | New York Central and its affiliates | Cincinnati, Ohio – Cleveland, Ohio [1948] | 1939-1958 |
| Midnight Special | Chicago, Indianapolis & Louisville | Chicago, Illinois – Cincinnati, Ohio [1943] | 1921-1952 |
| Midnight Special | Amtrak | Washington, DC – Philadelphia, Pennsylvania [1994] | 1994 |
| Midnight Sun | Alaska Railroad | Anchorage, Alaska – Fairbanks, Alaska [1960] | 1960 |
| Midwest Hiawatha | Milwaukee Road | Chicago, Illinois – Sioux Falls, South Dakota (various endpoints over the years)[1952] | 1940-1956 |
| Midwestern | New York Central Railroad | Chicago, Illinois – Cincinnati, Ohio [1957] | 1957-1959 |
| Mill Cities Limited | Chicago Great Western | Minneapolis–Saint Paul – Kansas City, Missouri [1948] | 1927-1952 |
| Minneapolis-Kansas City Rocket | Chicago, Rock Island and Pacific Railroad | Minneapolis–Saint Paul – Kansas City, Missouri [1941] | 1941-1944 |
| Minneapolis-Sioux Falls-Yankton Night Express | Great Northern Railway | Minneapolis–Saint Paul – Yankton, South Dakota [1935] | 1935-1940 |
| Minnesota 400 | Chicago & North Western | Mankato, Minnesota – Wyeville, Wisconsin [1948] | 1936-1952 |
| Minnesota and Black Hills Express | Chicago & North Western | Chicago, Illinois – Rapid City, South Dakota [1918] | 1914-1937; 1948-1955 |
| Minnesota Limited | Chicago, Burlington & Quincy | Chicago, Illinois – Minneapolis–Saint Paul [1916] | 1910-1918; 1922-1926 |
| Minnesota Marquette | Milwaukee Road | Chicago, Illinois – Minneapolis–Saint Paul [1948] | 1939-1950 |
| Minnesotan [4] | Chicago Great Western | Chicago, Illinois – Minneapolis–Saint Paul [1933] | 1930-1956 (name dropped in 1949) [5] |
| Minute Man | Boston and Maine | Boston, Massachusetts – Troy, New York [1948] | 1927-1957 |
| Minute Man | Amtrak [6] | Boston, Massachusetts – Philadelphia, Pennsylvania (1972–1973) Boston – Washington, DC (1973–1998) | 1973-1998 |
| Miss Lou | Illinois Central | Jackson, Mississippi – New Orleans, Louisiana [1944] | 1942-1949 |
| Missionary | Santa Fe | Chicago, Illinois – Kansas City, Missouri (and points beyond in many years) [1935] | 1915-1936 |
| Mississippi Valley | Chicago, Burlington & Quincy, Northern Pacific Railway | St. Louis, Missouri – Portland, Oregon [1920] | 1911-1936 |
| Missouri Limited | Chicago, Burlington & Quincy | Chicago, Illinois – Kansas City, Missouri [1930] | 1909-1918; 1923-1931 |
|
| Missouri River Eagle | Missouri Pacific | St. Louis, Missouri – Omaha, Nebraska [1948] | 1940-1971 |
| Missouri River Express | Chicago & North Western | Minneapolis–Saint Paul – Omaha, Nebraska [1924] | 1913-1926 |
| Missouri River Flyer | Santa Fe | Denver, Colorado – La Junta, Colorado [1913] | 1902-1904; 1907-1915 |
| Missouri River Runner | Amtrak | St. Louis, Missouri – Kansas City, Missouri [2010] | 2009–present |
| Missouri State Express | Chicago and Alton | St. Louis, Missouri – Kansas City, Missouri [1901] | 1901-1905 |
| Missourian | Missouri Pacific | St. Louis, Missouri – Kansas City, Missouri [1948] | 1925-1963 |
| Missourian | New York Central | St. Louis, Missouri – New York, New York [1928] | 1928-1958 |
| Mohawk | Grand Trunk Western | Chicago, Illinois – Detroit, Michigan | 1967-1971 |
| Mohawk | New York Central | New York, New York – Buffalo, New York (many different endpoints over the years) [1948] | 1911-1963 |
| Mohawk | Amtrak | New York, New York – Schenectady, New York [1991] | 1981-1985; 1991-1998 |
| Mohawk and Hudson River Express | West Shore Railroad | New York, New York – Albany, New York [1903] | 1899-1916 |
| Mondamin | Chicago & North Western | Minneapolis, Minnesota – Sioux City, Iowa [1948] | 1931-1952 |
| Monmouth Express | Pennsylvania | Philadelphia, Pennsylvania – Long Branch, New Jersey [1930] | 1920-1932 |
| Montreal and Boston Express | Soo Line Railroad, Canadian Pacific Railway, Boston and Maine | Minneapolis–Saint Paul – Boston, Massachusetts [1916] | 1890-1893; 1903-1916 |
| Montreal Express | New York Central, Rutland Railroad, Delaware and Hudson Railway | New York, New York – Montreal, Quebec [1916] | 1902-1924 |
| Montreal Express | Canadian Pacific Railway, Wabash Railroad | Chicago, Illinois – Toronto, Ontario – Montreal, Quebec [1903] | 1903-1909 |
| Montreal Express | Grand Trunk Western Railroad, Boston and Maine | Chicago, Illinois – Montreal, Quebec – Boston, Massachusetts [1916] | 1908-1917 |
| Montreal Limited | Delaware & Hudson, New York Central | New York, New York – Montreal, Quebec [1948] | 1925-1971 |
| Montrealer [7] | Pennsylvania Railroad, New Haven, Boston & Maine, Central Vermont, and Canadian National | Washington, DC – Montreal, Quebec [1952] | 1924-1966 |
| Montrealer | Amtrak | Washington, DC – Montreal, Quebec [1981] | 1972-1995 |
| Morning Congressional | Pennsylvania | New York, New York – Washington, DC [1956] | 1950-1971 |
| Morning Daylight | Southern Pacific | Los Angeles, California – San Francisco, California [1941] | 1940-1952 |
| Morning Executive | Amtrak | New York, New York – Washington, DC [1971] | 1971-1972 |
| Morning Express | Northern Pacific Railway | Minneapolis–Saint Paul – Duluth, Minnesota [1902] | 1901-1905 |
| Morning Express | New Haven Railroad | New York, New York – Boston, Massachusetts [1912] | 1905-1913 |
| Morning Flyer | Grand Rapids & Indiana | Chicago, Illinois – Grand Rapids, Michigan [1905] | 1904-1911 |
| Morning Hiawatha | Milwaukee Road | Chicago, Illinois – St. Paul, Minnesota [1948] | 1939-1971 |
| Morning Keystone | Pennsylvania | New York, New York – Washington, DC [1957] | 1956-1959 |
| Morning Liberty Express | Amtrak | Boston, Massachusetts – Philadelphia, Pennsylvania [1978] | 1978-1979 |
| Morning Puget Sounder | Great Northern Railway | Seattle, Washington – Vancouver, British Columbia [1947] | 1946-1950 |
| Morning Star | St. Louis Southwestern | St. Louis, Missouri – Dallas, Texas [1948]
Memphis, Tennessee – Dallas, Texas [1952] | 1941-1950 |
| Morning Steel King | New York Central, Erie Railroad | Pittsburgh, Pennsylvania – Cleveland, Ohio [1958] | 1953-1962 |
| Morning Steeler | Pennsylvania | Pittsburgh, Pennsylvania – Cleveland, Ohio [1952] (earlier years New York endpoint) | 1950-1957 |
| Morning Zephyr | Chicago, Burlington & Quincy | Chicago, Illinois – Minneapolis–St. Paul [1938] | 1936-1971 |
| Motor City Special | New York Central | Chicago, Illinois – Detroit, Michigan [1922] | 1917-1965 |
| Motor Queen | New York Central | Detroit, Michigan – Cincinnati, Ohio [1929] | 1929 |
| Mound City | Illinois Terminal Railroad | St. Louis, Missouri – Peoria, Illinois [1950] | 1949-1956 |
| Mound City Limited | Baltimore and Ohio Railroad | Cincinnati, Ohio – St. Louis, Missouri [1908] | 1905-1916 |
| Mound City Special | Cleveland, Cincinnati, Chicago and St. Louis Railway | Cincinnati, Ohio – St. Louis, Missouri – Cleveland, Ohio [1935] | 1925-1936 |
| Mount Adams | Amtrak | Seattle, Washington – Portland, Oregon [1995] | 1995-1997 |
| Mount Baker International | Amtrak | Seattle, Washington – Vancouver, British Columbia [1996] | 1996-1997 |
| Mount Rainier | Amtrak | Seattle, Washington – Portland, Oregon [1978] | 1974-1995 |
| Mount Royal | New York Central,
Boston & Maine,
Rutland, and Canadian National | New York, New York and Boston, Massachusetts – Montreal, Quebec [1952] | 1925-1953 |
| Mount Vernon | Pennsylvania; Amtrak from 1976 | New York, New York – Washington, DC [1956] | 1933-1971; 1976; 1980-1991; 1997-1998 |
| Mountain Bluebird | Chicago and North Western, Union Pacific Railroad | Chicago, Illinois – Denver, Colorado [1933] | 1931-1937 |
| Mountain Express | Erie | Jersey City, New Jersey – Port Jervis, New York [1938] | 1931; 1936-1953 |
| Mountain Special | Delaware, Lackawanna and Western Railroad | Hoboken, New Jersey – Scranton, Pennsylvania [1935] | 1921; 1935-1952 |
| Mountaineer | Minneapolis, St. Paul and Sault Ste. Marie Railway | Chicago, Illinois – Vancouver, British Columbia [1948],
later Minneapolis-St. Paul – Vancouver, British Columbia | 1932-1955 |
| Mountaineer (Boston and Maine) | Maine Central and Boston & Maine | Boston, Massachusetts – Littleton, New Hampshire [1948] | 1947-1955 |
| Mountaineer | Amtrak | Chicago, Illinois – Norfolk, Virginia [1975] | 1975-1976 |
| Mountaineer | Pennsylvania | Philadelphia, Pennsylvania – Wilkes-Barre, Pennsylvania [1908] | 1901-1934 |
| Mountaineer | Denver and Rio Grande Western Railroad | Denver, Colorado – Montrose, Colorado [1948] | 1936-1959 |
| Mudlavia and Brazil Express | Chicago and Eastern Illinois Railroad | Chicago, Illinois – Terre Haute, Indiana [1902] | 1902-1906 |
| Murray Hill | New Haven Railroad | New York, New York – Boston, Massachusetts [1945] | 1940-1971 |
| Murray Hill | Amtrak | New York, New York – Boston, Massachusetts [1975] | 1973-1981 |