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GCR Class 8B
GCR Class 8B was a class of 25 two-cylinder steam locomotives of the 4-4-2 wheel arrangement built between 1903 and 1906 for the Great Central Railway.
==GCR era==
Facing a potential rise in passenger traffic, the Great Central Railway placed an order for 2 pairs of different locomotives - one pair being the 4-6-0 GCR Class 8C, the other pair being this 4-4-2 locomotive. The two locomotives shared as many common components as possible to allow easy conversion of the 8Bs to the 4-6-0 configuration - and both designs borrowed heavily from John G. Robinson's earlier GCR Class 8.
However, due to a much smaller than anticipated traffic increase, no further Class 8Cs were built, and instead a further 25 Class 8Bs were ordered and built between 1904 and 1906 - built with larger fireboxes as there was no longer a need to convert the locomotives to a 4-6-0 configuration. In 1909 and 1910, the original locomotives also received this larger firebox.
Despite Robinson commencing the conversion to superheaters in 1912, the conversion was not actually completed until 1936. At the same time, any locomotive requiring cylinder replacement saw both larger cylinders and piston valves being fitted - 20 of the class would eventually receive this modification. From 1921, the Ramsbottom safety valves were phased out and removed, to be replaced by Ross pop safety valves.
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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