18 engines built by 3 makers and delivered between January 1841 and July 1842.
They had 5 foot (1.54 metre) coupled driving wheels and were the first purpose built goods locomotives on the GWR.
Like the Sun class, they were found to lack adhesive weight, so were converted to saddle tanks in 1849/50. Most were withdrawn in 1870, although 4 survived until 1874.
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