Mallet locomotive
The first Mallet locomotive in the United States was Baltimore &amp; Ohio Railroad number 2400, built by Alco in 1904. Nicknamed "Old Maude", it was a 0-6-6-0 weighing and with axle loads of . 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.