Pony truck
(重定向自Pony trucks)
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A pony truck, in railway terminology, is a leading truck with only two wheels.
Its invention is generally credited to Levi Bissell, who devised one in 1857 and patented it the following year. Hence the term Bissel bogie (spelt with one 'l') or axle is used in continental Europe. In the UK, the term is Bissell truck with two 'l's.