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A Bissell or Bissel truck (also Bissel bogie or pony truck) is a single-axle bogie which pivots towards the centre of a steam locomotive to enable it to negotiate curves more easily. Invented in 1857 by Levi Bissell [ de ] [ 1 ] and usually then known as a pony truck , it is a very simple and common means of designing a carrying wheel .
The LNWR 317 class, (also known as Saddle Tank Shunter, Dock Tank or Bissel Tank) consisted of a class of 20 square saddle-tanked steam locomotives built by the London and North Western Railway at their Crewe Works between 1896 and 1901. They had a very short coupled wheelbase, with a trailing Bissel truck to carry weight.
The Type FT tender was an unusual type which used six pairs of wheels in a 2-8-2 wheel arrangement, with the leading and trailing wheels in Bissel-type pony trucks and the rest of the axles mounted with a rigid wheelbase. Like the leading and trailing wheels of the engine, all tender wheels were fitted with roller bearings.
Because of the widened frames, trailing carrier wheels were incorporated to take the weight of the firebox. Unlike usual practice, they were not arranged as a bissel truck, but the outside axle boxes worked in hornblocks bolted to the frames. The result was that the fixed wheelbase was extended backwards beyond that of the coupled wheels.
The trailing Bissel truck was of the Cartazzi type which allowed the axle some lateral movement. [ 2 ] [ 3 ] [ 4 ] The leading bogie was controlled by two side-check springs and had 4 inches (102 millimetres) of side-play in each direction.
The locomotive's Type FT tender was an experimental type using six pairs of wheels in a 2-8-2 wheel arrangement, with the leading and trailing wheels as bissel-type pony trucks and the remainder mounted on a rigid wheelbase.
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