This article contains a list of named passenger trains in the United States, with names beginning I through M.[1]
| Train Name | Railroad | Train Endpoints in a typical [year] | Operated | |
|---|---|---|---|---|
| Idaho Express | Union Pacific Railroad | Salt Lake City, Utah – Boise, Idaho [1932] | 1911-1913; 1919-1924; 1932-1933; 1942-1946 | |
| Idahoan | Union Pacific Railroad | Cheyenne, Wyoming – Portland, Oregon [1948] | 1947-1954 | |
| Illini | Illinois Central | Chicago, Illinois – Champaign, Illinois [1942] | 1942-1949; 1969-1971 | |
| Illini | Amtrak | Chicago, Illinois – Carbondale, Illinois [2014] | 1974–present | |
| Illinois Zephyr | Amtrak | Chicago, Illinois – Quincy, Illinois [2015] | 1971–present | |
| Illmo Limited | Illinois Terminal Railroad | St. Louis, Missouri – Peoria, Illinois [1941] | 1929-1948 | |
| Imperial | Southern Pacific | Los Angeles, California – Calexico, California [1931] | 1931-1941 | |
| Imperial | Southern Pacific, Chicago, Rock Island and Pacific Railroad | Chicago, Illinois – Los Angeles, California [1948] | 1947-1958 | |
| Independence | Amtrak | New York, New York – Washington, DC [1985] | 1982-1995 | |
| Indian Head | Chicago and North Western Railway | Chicago, Illinois – Drummond, Wisconsin [1948] | 1948-1952 | |
| Indiana Connection | see Calumet | |||
| Indiana Special | Cleveland, Cincinnati, Chicago and St. Louis Railway | Detroit, Michigan – Indianapolis, Indiana [1920] | 1919-1921; 1925-1939 | |
| Indianapolis Express | New York Central | Detroit, Michigan – St. Louis, Missouri (with many different endpoints over the years) [1952] | 1917-1920; 1931-1957 | |
| Indianapolis Limited | Cleveland, Cincinnati, Chicago and St. Louis Railway | Cincinnati, Ohio – Indianapolis, Indiana [1923] | 1921-1929 | |
| Indianapolis Limited | Pennsylvania | New York, New York – Indianapolis, Indiana [1950] | 1950; 1953-1957 | |
| Indianapolis Midnight Special | Pennsylvania | Chicago, Illinois – Louisville, Kentucky [1908] | 1906-1910 | |
| Indianapolis Special | Cleveland, Cincinnati, Chicago and St. Louis Railway | Cleveland, Ohio – Indianapolis, Indiana [1920] | 1919-1924; 1929-1932 | |
| Inter-American | Amtrak | St. Louis, Missouri – Laredo, Texas [1975] | 1973-1981 | |
| Inter-City Express | New York Central | Buffalo, New York – Syracuse, New York [1927] | 1927-1931 | |
| Inter-City Limited[2] | Grand Trunk Western and Canadian National | Chicago, Illinois – Montreal, Quebec [1948] | 1927-c.1965 | |
| Inter-State Limited | Chicago North Shore and Milwaukee Railroad | Chicago, Illinois – Milwaukee, Wisconsin [1929] | 1929-1933 | |
| International (group of trains) | Great Northern | Seattle, Washington – Vancouver, British Columbia | 1950-1971 | |
| International Express | Pennsylvania | Philadelphia, Pennsylvania – Harrisburg, Pennsylvania [1930] | 1913-1937 | |
| International Limited | Grand Trunk Western and Canadian National | Chicago, Illinois – Toronto, Ontario [1955] | 1901-1910; 1919-1971 | |
| International Limited | Amtrak and Via | Chicago, Illinois – Toronto, Ontario [1990] | 1982-2004 | |
| International Limited | Great Northern | Portland, Oregon – Vancouver, British Columbia [1935] | 1911-1924; 1931-1946 | |
| Interstate Express | New York Central | Chicago, Illinois – Boston, Massachusetts [1952] | 1921-1958 | |
| Interstate Express | Reading–CNJ–Lackawanna | Philadelphia, Pennsylvania – Syracuse, New York [1950] | 1929-1957 | |
| Iowa and Dakota Express | Chicago and North Western Railway | Chicago, Illinois – Hawarden, Iowa [1916] | 1897; 1914-1924 | |
| Iowa Express | Chicago Great Western | Minneapolis–Saint Paul – Kansas City, Missouri [1912] | 1912-1930 | |
| Iowa-Nebraska Limited | Chicago, Rock Island and Pacific Railroad | Chicago, Illinois – Lincoln, Nebraska [1930] | 1925-1946 | |
| Iowan | Illinois Central | Chicago, Illinois – Sioux City, Iowa[3] [1948] | 1931-1952 | |
| Iron and Copper Country Express | Chicago and North Western Railway | Chicago, Illinois – Ishpeming, Michigan [1948] | 1914-1958 | |
| Iron City Express | Pennsylvania | New York, New York – Pittsburgh, Pennsylvania [1913] | 1909-1953 | |
| Iron Country Limited | Chicago, Milwaukee, St. Paul and Pacific Railroad | Chicago, Illinois – Iron River, Michigan [1933] | 1931-1938 | |
| Iron Range Express | Chicago and North Western Railway | Chicago, Illinois Menomonie, Wisconsin [1915] | 1900-1901; 1914-1936 | |
| Iroquois | New York Central | New York, New York – Boston, Massachusetts – Chicago, Illinois [1948] | 1926-1967 | |
| Irvin S. Cobb | Illinois Central | Louisville, Kentucky – Memphis, Tennessee [1952] | 1949-1955 | |
| Islander | New York, New Haven & Hartford | Boston, Massachusetts, then New York, New York – Woods Hole, Massachusetts [1931] | 1937-1942 |
| Train Name | Railroad | Train Endpoints in a typical [year] | Operated | |
|---|---|---|---|---|
| James River | Amtrak | Richmond, Virginia – Newport News, Virginia [1995] | 1995-1998 | |
| James Whitcomb Riley | New York Central | Chicago, Illinois – Cincinnati, Ohio [1948] | 1941-1971 | |
| Amtrak | Chicago, Illinois – Washington, DC [1975] | 1971-1977 | ||
| Jeffersonian | Pennsylvania | New York, New York – St Louis, Missouri [1948] | 1941-1953 | |
| Jeffersonian | Amtrak | New York, New York – Washington, DC [1985] | 1982-1990 | |
| Jet Rocket | Rock Island | Chicago, Illinois – Peoria, Illinois [1956] | 1956-1957 | |
| Joe Wheeler | Southern | Oakdale, Tennessee – Tuscumbia, Alabama [1940] | c.1940-c.1946 | |
| John Adams | Amtrak | Boston, Massachusetts – Philadelphia, Pennsylvania [1977] | 1977 | |
| John Quincy Adams | New Haven Railroad | New York, New York – Boston, Massachusetts | 1957-? | |
| John Wilkes | Lehigh Valley | New York, New York – Coxton, Pennsylvania – Wilkes-Barre, Pennsylvania [1942] | 1939-1961 | |
| Judiciary | Pennsylvania | New York, New York – Washington, DC [1952] | 1933-1955 | |
| Judith Special | Great Northern | Lewiston, Idaho – Great Falls, Montana [1920] | 1919-1924 | |
| Juniata | Pennsylvania Railroad | New York, New York – Pittsburgh, Pennsylvania [1952] | 1927-1934; 1938-1971 |
| Train Name | Railroad | Train Endpoints in a typical [year] | Operated | |
|---|---|---|---|---|
| Kalamazoo, Grand Rapids and Detroit Express | Michigan Central Railroad | Chicago, Illinois – Grand Rapids, Michigan [1916] | 1916-1920 | |
| Kansas City and Chicago Fast Mail | Santa Fe | Kansas City, Missouri – Galveston, Texas [1911] | 1906-1916 | |
| Kansas City and St. Louis Express | Missouri Pacific | St. Louis, Missouri – Denver, Colorado [1903] | 1900-1910 | |
| Kansas City Chief | Santa Fe | Chicago, Illinois – Kansas City, Missouri [1950] | 1950-1968 | |
| Kansas City Day Express | Alton Railroad | St. Louis, Missouri – Kansas City, Missouri [1892] | 1892-1900 | |
| Kansas City Express | St. Louis-San Francisco | Kansas City, Missouri – Memphis, Tennessee [1905] | 1902-1908 | |
| Kansas City Express | Missouri-Kansas-Texas | Kansas City, Missouri – Galveston, Texas [1908] | 1904-1910; 1915-1916; 1921-1926 | |
| Kansas City Express | Union Pacific Railroad | Kansas City, Missouri – Cheyenne, Wyoming [1922] | 1921-1934 | |
| Kansas City Express | Kansas City Southern Railway | Kansas City, Missouri – Port Arthur, Texas [1930] | 1929-1932 | |
| Kansas City Express | Chicago, Rock Island and Pacific Railroad | Chicago, Illinois – Kansas City, Missouri [1932] | 1932-1936 | |
| Kansas City Express | Wabash Railroad | St. Louis, Missouri – Kansas City, Missouri [1940] | 1937-1947 | |
| Kansas City Flyer | Santa Fe | Kansas City, Missouri – Galveston, Texas [1912] | 1910-1916 | |
| Kansas City Limited | Chicago Great Western | Minneapolis–Saint Paul – Kansas City, Missouri [1922] | 1896-1901; 1922-1926 | |
| Kansas City Mail | St. Louis-San Francisco | Kansas City, Missouri – Dallas, Texas [1902] | 1898-1908 | |
| Kansas City Mule | Amtrak | St. Louis, Missouri – Kansas City, Missouri [1983] | 1980-2009 | |
| Kansas City Rocket | Chicago, Rock Island and Pacific Railroad | Minneapolis–Saint Paul – Kansas City, Missouri [1960] | 1957-1962 | |
| Kansas City Special | Chicago Great Western | Minneapolis–Saint Paul – Kansas City, Missouri [1916] | 1898-1909; 1912-1918 | |
| Kansas City Vestibuled Limited | Alton Railroad | St. Louis, Missouri – Kansas City, Missouri [1901] | 1892-1904 | |
| Kansas City Zephyr | Chicago, Burlington & Quincy | Chicago, Illinois – Kansas City, Missouri | 1953-1968 | |
| Kansas City - Florida Special | St. Louis-San Francisco – Southern – Atlantic Coast Line – Florida East Coast | Kansas City, Missouri – Miami, Florida (endpoints differed over the years) [1948] | 1902-1965 | |
| Kansas City - Hot Springs Express | Missouri Pacific | Hot Springs, Arkansas – Kansas City, Missouri | ? | |
| Kansas Cityan | Santa Fe | Chicago, Illinois – Kansas City, Missouri – Oklahoma City, Oklahoma [1952] | 1915-1933; 1938-1968 | |
| Kansas Fast Mail | Santa Fe | Kansas City, Missouri – Purcell, Oklahoma [1910] | 1910-1918 | |
| Kansas Limited | St. Louis-San Francisco | St. Louis, Missouri – Galveston, Texas [1925] | 1905; 1917-1928 | |
| Kansas Mail | St. Louis-San Francisco | St. Louis, Missouri – Wichita, Kansas [1922] | 1921-1927 | |
| Katahdin | Boston and Maine, Maine Central Railroad Company | Boston, Massachusetts – Bangor, Maine [1953] | 1951-1958 | |
| Kate Shelley 400 | Chicago and North Western | Chicago, Illinois – Cedar Rapids, Iowa [1955] | 1955-1971 | |
| Katy Flyer | Missouri-Kansas-Texas | St. Louis, Missouri – San Antonio, Texas (various endpoints over the years) [1948] | 1896; 1900-1959 | |
| Katy Limited | Missouri-Kansas-Texas | Kansas City, Missouri – Fort Worth, Texas [1948] | 1910-1951 | |
| Kay-See Flyer | Missouri Pacific Railroad | St. Louis, Missouri – Kansas City, Missouri | ? | |
| Kennebec Limited | Boston and Maine, Maine Central Railroad Company | Boston, Massachusetts – Bangor, Maine [1953] | 1937-1958 | |
| Kentuckian | Chesapeake and Ohio Railway | Chicago, Illinois – St. Louis, Missouri – Washington, DC – Newport News, Virginia [1930] | 1929-1933 | |
| Kentuckian | Pennsylvania | Chicago, Illinois – Louisville, Kentucky [1935] | 1935-1968 | |
| Kentucky Cardinal | Illinois Central | Louisville, Kentucky – Fulton, Kentucky [1952] | 1950-1953 | |
| Kentucky Cardinal | Amtrak | Chicago, Illinois – Louisville, Kentucky [2000] | 1999-2003 | |
| Key West Express | Florida East Coast Railway | Jacksonville, Florida – Key West, Florida [1924] | 1910-1926 | |
| Keystone (group of trains) | Amtrak | New York, New York – Harrisburg, Pennsylvania (1980) | 1971-1972; 1980-1981; 1991-2007 | |
| Keystone Executive | Amtrak | Philadelphia, Pennsylvania – Harrisburg, Pennsylvania [1984] | 1983-1988 | |
| Keystone Express | Delaware, Lackawanna and Western Railroad | Scranton, Pennsylvania – Pittsburgh, Pennsylvania (1939) | 1936-1949 | |
| Keystone Express | Pennsylvania | New York, New York – St. Louis, Missouri (various endpoints over the years) [1914] | 1891-1896; 1904-1931; 1937-1940 | |
| Keystone Express | Delaware, Lackawanna and Western Railroad | Scranton, Pennsylvania – Pittsburgh, Pennsylvania (1939) | c.1936-c.1947 | |
| Keystone State Express | Amtrak | New York, New York – Harrisburg, Pennsylvania (1980) | 1991-1995 | |
| King Coal | Reading | Philadelphia, Pennsylvania – Shamokin, Pennsylvania [1951] | 1950-1964 | |
| Klamath | Southern Pacific | San Francisco, California – Portland, Oregon [1952] | 1929-1955 | |
| Knickerbocker | New York Central | New York, New York – St. Louis, Missouri (various endpoints over the years) [1948] | 1895-1967 | |
| Knickerbocker | Amtrak | New York, New York – Albany, New York [1991] | 1974-1976; 1991-1994 | |
| Knickerbocker Limited | New Haven Railroad | New York, New York – Boston, Massachusetts [1925] | 1902-1932 |
| Train Name | Railroad | Train Endpoints | Operated | |
|---|---|---|---|---|
| La Salle | Chicago and Eastern Illinois Railroad | Chicago, Illinois – St. Louis, Missouri [1928] | 1925-1933 | |
| La Salle | Grand Trunk Western and Canadian National | Chicago, Illinois – Toronto, Ontario – Montreal, Quebec [1938] | 1937-c.1965 | |
| La Salle Street Limited | Chicago, Rock Island and Pacific Railroad | Chicago, Illinois – Omaha, Nebraska [1942] | 1935-1953 | |
| Lackawanna Limited | Delaware, Lackawanna and Western Railroad | Hoboken, New Jersey – Buffalo, New York [1948] | 1901-1949 | |
| Lackawanna Special | Delaware, Lackawanna and Western Railroad | Hoboken, New Jersey – Buffalo, New York [1926] | 1925-1936 | |
| Lake Cities | Erie Railroad, later Erie Lackawanna | Chicago, Illinois – Hoboken, New Jersey [1952] | 1929-1970 | |
| Lake Cities | Amtrak | Chicago, Illinois – Toledo, Ohio (1980–1995) [1980] Chicago, Illinois – Pontiac, Michigan (1995–2004) [1995] | 1980-2004 | |
| Lake Cities Special | New York Central | Detroit, Michigan – Pittsburgh, Pennsylvania [1935] | 1926-1952 | |
| Lake Country Limited | Amtrak | Chicago, Illinois – Janesville, Wisconsin [2000] | 2000-2001 | |
| Lake Erie | New York Central | Albany, New York – Buffalo, New York [1930] | 1927-1931 | |
| Lake Shore | Amtrak | Chicago, Illinois – New York, New York [1971] | 1971-1972 | |
| Lake Shore Limited | Amtrak | Chicago, Illinois – New York, New York – Boston, Massachusetts [1980] | 1975-present | |
| Lake Shore Limited | New York Central | Chicago, Illinois – New York, New York [1948] | 1897-1956 | |
| Lake Superior Limited | Duluth, South Shore & Atlantic | Houghton, Michigan – St. Ignace, Michigan (with through trains to many other destinations) [1900] | 1893-1900 | |
| Lake Superior Limited | Northern Pacific Railway | Minneapolis–Saint Paul – Duluth, Minnesota [1928] | 1901-1905; 1921-1930 | |
| The Laker | Soo Line | Chicago, Illinois – Duluth, Minnesota [1952] | 1951-1965 | |
| Land O'Corn | Illinois Central | Chicago, Illinois – Waterloo, Iowa [1960] | 1941-1967 | |
| Lark | Southern Pacific | San Francisco, California – Los Angeles, California [1948] | 1911-1968 | |
| Las Vegas Holiday Special | Union Pacific Railroad | Los Angeles, California – Las Vegas, Nevada [1965] | 1962-1967 | |
| Las Vegas Limited | Amtrak | Los Angeles, California – Las Vegas, Nevada [1976] | 1976 | |
| LaSalle | Amtrak | Chicago, Illinois – Milwaukee, Wisconsin [1984] | 1980-1989 | |
| Laurentian | Delaware & Hudson, New York Central, Canadian Pacific Railway | New York, New York – Montreal, Quebec [1948] | 1923-1971 | |
| Legion | Pennsylvania Railroad | New York, New York – Washington, D.C. [1948] | 1944-1952 | |
| Legionnaire[4] | Chicago Great Western | Minneapolis–St. Paul – Chicago, – Kansas City, Missouri [1930] | 1925-1930 (renamed "The Minnesotan") | |
| Legislator | Pennsylvania Railroad | Washington, DC – New York, New York [1952] | 1932-1971 | |
| Lehigh Express | Grand Trunk Western, Lehigh Valley Railroad | New York, New York – Philadelphia, Pennsylvania – Chicago, Illinois [1912] | 1894-1914 | |
| Lehigh Limited | Lehigh Valley Railroad | New York, New York – Buffalo, New York (with through trains to many other cities) [1930] | 1917-1936 | |
| Lehigh-Pennsylvania Express | Lehigh Valley Railroad, Pennsylvania Railroad | Pittsburgh, Pennsylvania – Phillipsburg, New Jersey [1918] | 1916-1932 | |
| Lexington Special | Louisville and Nashville Railroad | Cincinnati, Ohio – Lexington, Kentucky [1922] | 1921-1935 | |
| Liberty Bell | Amtrak | Washington, DC – New York, New York [1995] | 1995-1998 | |
| Liberty Express | Amtrak | Philadelphia, Pennsylvania – Boston, Massachusetts [1980] | 1979-1982 | |
| Liberty Limited | Pennsylvania Railroad | Chicago, Illinois – Washington, DC [1948] | 1925-1957 | |
| Lincoln Limited | Chicago and Alton | Chicago, Illinois – St. Louis, Missouri [1930] | 1925-1935 | |
| Lincoln Service | Amtrak | Chicago, Illinois – St. Louis, Missouri | 2006-present | |
| Litchfield | New Haven Railroad | New York, New York – Pittsfield, Massachusetts [1960] | 1956-1968 | |
| Lock Haven Express | Pennsylvania Railroad | Philadelphia, Pennsylvania – Williamsport, Pennsylvania [1923] | 1923-1933 | |
| Lone Star | St. Louis Southwestern | Memphis, Tennessee – Dallas, Texas [1948] | 1928-1952 | |
| Lone Star | Amtrak | Chicago, Illinois – Dallas, Texas Chicago, Illinois – Houston, Texas [1974] | 1974-1979 | |
| Lone Star Limited | Texas Midland Railroad | Paris, Texas – Ennis, Texas (with through cars to St. Louis and Galveston) [1902] | 1902-1912 | |
| Lookout | Nashville, Chattanooga and St. Louis Railway | Nashville, Tennessee – Chattanooga, Tennessee (with through cars to New York) [1933] | 1932-1946 | |
| Loop | Amtrak | Chicago, Illinois – Springfield, Illinois [1990] | 1986-1996 | |
| Los Angeles Challenger | Chicago and North Western, Union Pacific Railroad | Chicago, Illinois – Los Angeles, California [1938] | 1938-1948 | |
| Los Angeles Express | Santa Fe | Chicago, Illinois – Los Angeles, California [1910] | 1905-1916 | |
| Los Angeles Limited | Chicago and North Western, Union Pacific Railroad | Chicago, Illinois – Los Angeles, California [1948] | 1906-1953 | |
| Louisiana Daylight | Texas and Pacific | New Orleans, Louisiana – Fort Worth, Texas [1950] | 1949-1963 | |
| Louisiana Eagle | Texas and Pacific | New Orleans, Louisiana – Fort Worth, Texas [1950] | 1949-1963 | |
| Louisiana Limited | Texas and Pacific | New Orleans, Louisiana – Fort Worth, Texas (with through cars to other points) [1930] | 1913-1949 | |
| Louisiana Sunshine Special | Missouri Pacific | Little Rock, Arkansas – Lake Charles, Louisiana [1948] | 1925-1930; 1948-1960 | |
| Louisiane | Illinois Central | Chicago, Illinois and Louisville, Kentucky – New Orleans, Louisiana [1952] | 1931-1967 | |
| Louisville and Cincinnati Limited | Illinois Central | Cincinnati, Ohio – New Orleans, Louisiana [1902] | 1897-1910; 1917-1918 | |
| Louisville Daylight Express | Pennsylvania Railroad | Chicago, Illinois – Louisville, Kentucky [1930] | 1911-1953 | |
| Louisville Express | Cleveland, Cincinnati, Chicago and St. Louis Railway | Chicago, Illinois – Louisville, Kentucky [1940] | 1931-1941 | |
| Louisville Limited | Illinois Central | New Orleans, Louisiana – Louisville, Kentucky [1922] | 1919-1930 | |
| Louisville Night Express | Pennsylvania Railroad | Chicago, Illinois – Louisville, Kentucky [1920] | 1914-1920; 1934-1935 | |
| Louisville Special | Pennsylvania Railroad | Chicago, Illinois – Louisville, Kentucky [1904] | 1904-1910 |
| 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 | 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, 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 | 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 | 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 | 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
| 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 |