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Bury Bar Frame locomotive
The Bury Bar Frame locomotive was an early type of steam locomotive, developed at the works of Edward Bury and Company, later named Bury, Curtis, and Kennedy. By the 1830s, the railway locomotive had evolved into three basic types - those developed by Robert Stephenson, Timothy Hackworth and Edward Bury.
==Frames==
A major problem was the effect of their weight on the track of the time. Engines were increasing in size as more power was needed. Robert Stephenson had developed the ''Patentee'' with an extra pair of wheels to distribute the weight. However this brought problems in that the extra length affected road-holding on curves. Such locomotives used a heavy, rigid frame of timber sandwiched between iron plates outside the wheels, plus internal iron sub-frames. Bury adopted a different approach by keeping to two axles and fabricating a bar frame inside the wheels, consisting (on each side) of two wrought-iron bars, a rectangular-section bar above the axle bearings and a round-section bar below.
From 1845 Bury built much bigger six-wheeled locomotives with bar frames; one of these, a 2-2-2 of 1847 was preserved and may be seen in Cork railway station.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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