Mallet locomotive
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A Mallet locomotive is a type of compound articulated steam locomotive, invented by the Swiss engineer Anatole Mallet.
A typical European Mallet type, a narrow-gauge 0-4-4-2T tank locomotive for a mountain railway, the RhB G 2/2+2/3 in Switzerland
A 2-10-10-2 Mallet locomotive in Winslow, Arizona, in 1913–1914 owned by the Atchison, Topeka and Santa Fe Railway.
MÁV Class 601 in 1914
Baltimore and Ohio Railroad No. 2400, the first American Mallet
Union Pacific Big Boy
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The Union Pacific Big Boy is a type of simple articulated 4-8-8-4 steam locomotive manufactured by the American Locomotive Company in Schenectady, New York, between 1941 and 1944 and operated by the U
Mallet locomotive
…division; a single locomotive hauled 9,500 short tons (8,600 t; 8,500 long tons) in five hours. Mallet development culminated in 1941 with the 4-8-8-4 Big Boy type on the Union Pacific railroad. They weighed 760,000 to 772,000 lb (345,000 to 350,000 kg) with a 434,000 lb (197,000 kg) tender; at 133 feet (40.54…
Publicity photo of Union Pacific Big Boy No. 4000, the first of the class, taken in 1941
The cab controls of No. 4005 at the Forney Transportation Museum in Denver, Colorado.
A close-up of a Hancock long-bell 3-chime "steamboat" whistle used on No. 4017.
No. 4014 travels the Sacramento Subdivision towards Roseville, California, in July 2024.