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| Book Title | Author |
| M | |
| (The) Ma & PA: A History of the Maryland & Pennsylvania Railroad | Hilton |
| Made in USA: The Secret Histories of the Things that Made America | Patton |
| Made in the Ives Shops: A Full Color Encyclopedia of Ives Toys (1901-1932) | Robinson |
| Main Lines, Rebirth of the North American Railroads 1970-2002 (2) | Saunders |
| Maine Central In Color, Vol. 1 | Plant |
| (The) Man Who Changed How Boys and Toys Were Made | Bruce Watson |
| (The) Man Who Lives in Paradise | A. C. Gilbert and Marshall McClintock |
| Maine Central in Color, Vol. 1 | Plant |
| Maine Central In Color, Vol.2 | Plant |
| Marx Train Catalogs (Greenberg) | Floyd |
| Merging Lines: American Railroads 1900-1970 | Saunders |
| Messrs. Ives of Bridgeport (FIRST EDITION) | Hertz |
| Metro-North's Hudson Line: Poughkeepsie to Oscawana | Panettiere |
| Metropolitan Railways: Rapid Transit in America | Middleton |
| (The) Mighty 800 | Kratville |
| Michigan Central Trackside with Emery Gulash | Doughty |
| Milwaukee (The City of) Vol. 2 | Koeller |
| (The) Milwaukee Electrics | Holley |
| (The) Milwaukee Road: MBI Railroad Color History) | Murray |
| (The) Milwaukee Road (Its First Hundred Years) | Derleth |
| (The) Milwaukee Road (1928-1985) (2) | Scribbins |
| Milwaukee Road (1850-1960 Photo Archive) | Letourneau |
| Milwaukee Road Color Guide to Fgt & Passenger Equip. Vol 1 | Nighswonger |
| Milwaukee Road Color Guide to Fgt & Passenger Equip. Vol 2 | Nighswonger |
| Milwaukee Road Depots 1856-1954 Photo Archive | Tschudy |
| (The) Milwaukee Road in Color (Vol. 3) Wisc. & Michigan | Strauss |
| (The) Milwaukee Road in Color (Vol. 4) IO, MO, MN, Dakotas | Strauss |
| (The) Milwaukee Road ( in Color, East End) (Vol. 1) | Raia |
| Milwaukee Road East | Dorin |
| Milwaukee Road in its Hometown | Scribbins |
| (The) Milwaukee Road Olympian - A Ride to Remember | Johnson |
| (The) Milwaukee Road Passenger Train Services: From the Hiawatha Era to Amtrak and Beyond | Dorin |
| Milwaukee Road Revisited | Johnson |
| Milwaukee Road Steam Power | Tigges |
| Milwaukee Road West | Wood |
| Milwaukee Road's Steam, Diesel and Electric Era | Stagner |
| Minneapolis & St. Louis In Color | Green |
| Minutemen Steam: Boston & Main Steam Locos, 1911-1958 | Frye |
| (The) Missabe Road...The Duluth, Missabe and Iron Range Railway | King |
| Missouri-Kansas-Texas Lines in Color | George |
| Missouri Pacific: Color Guide to Freight and Passenger Equipment | Kinkaid |
| (The) Missouri Pacific Lines in Color | Collias |
| Missouri Pacific in Color , Vol. 1: The Era of the Eagles | Boyd |
| Missouri Pacific in Color, Vol. 2: Screaming Eagles | Boyd |
| Missouri Pacific Lines: Pullmans to St. Louis | TRRA |
| Missouri Pacific Passenger Trains: The Postwar Years | Dorin |
| Missouri Pacific: River and Prairie Rails - The MoPac in Neb. | Bartels |
| Missouri Pacific's Steam to Diesel Era: 1945-1955 | Stagner |
| (The) 1925 Modern American Locomotive: Construction and Operation | Prior |
| Modern Diesel Locomotives | Halberstadt |
| Modern Locomotives: High-Horsepower Diesels 1966-2000 | Solomon |
| Modern Trains and Splendid Stations | Merrill |
| Monon: The Hoosier Line | Dolzall & Dolzall |
| Monon in Color | Lewnard |
| Mopac Power | Collias |
| (The) Monongahela Railroad: Its History & Operation 1903-1993 | Gratz |
| More Classic American Railroads | Schafer |
| More Class Trains | Dubin |
| Motive Power of the Union Pacific | Kratville & Ranks |
| (The) Moving Metropolis | Taylor |
| MTH Electric Train Price, Greenberg Guide (Earl Court) | Greenberg |