US Usage
The first American example was an Alco locomotive built for the Baltimore & Ohio Railroad in 1903; it was an 0-6-6-0 weighing 334,500 lb and with axle laods of 60,000 lb. Received negatively at first due to speed limitation arising from the short wheelbase and stiff suspension, it gained support during service, and it was soon followed by Baldwin examples, and then steadily heavier and more powerful successors.
As weight and power and length increased, there were experiments with flexible boiler casings; from 1910 the Santa Fe road introduced 2-6-6-2 locomotives weighing 392,000 lb, with a 37 feet long boiler barrel, with a firetube reheater and a firetube feedwater section in front, each separated by a blank section, and variants of a telescopic or bellows type boiler casing. These were unsuccessful, and later engines used conventional boilers.
The largest compound Mallets were ten 2-10-10-2s built for the Virginian by Alco in 1918; in pairs they pushed coal trains headed by a 2-8-8-2.
Read more about this topic: Mallet Locomotive
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