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