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Baltimore and Ohio 0-6-6-0 Mallet Steam Locomotive

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B&O #2400 was the first standard-guage Mallet built in the U.S.

The Baltimore & Ohio Railroad (B&O) 0-6-6-0 type compound articulated Mallet steam locomotive was built at the Schenectady plant of the American Locomotive Company (ALCO) in 1904. Only one such locomotive, #2400, was built. The locomotive was used as a helper engine on the B&O's mountain grades west of Cumberland, Md. It was the first standard-gauge Mallet built in the United States. The locomotive was originally designated as Class O but was changed to Class DD-1 and the engine renumbered to #7000 in 1915. The locomotive was scrapped in 1938.

More information about the B&O DD-1 Class Mallet can be found at SteamLocomotive.com. Photos of #2400 can be found at http://www.northeast.railfan.net.

To obtain the drawings of the Baltimore and Ohio 0-6-6-0 Mallet steam locomotive (shown below), visit Google Books and download a copy of the book (PDF).


The Dec. 18, 1908 edition of Railroad Age Gazette also contained a drawing of the B&O Mallet.

Visit Google Books to download a copy of the book (PDF).