The first 19 locomotives ordered by Isambard Kingdom Brunel for the Great Western Railway included two unusual Haigh Foundry locomotives. Snake and Viper were built at the Haigh Foundry and delivered in September 1838. They had 14.75 in × 18 in (375 mm × 457 mm) cylinders and the driving wheels geared 2:3 to keep the cylinder stroke speed low while allowing high track speed, in line with Brunel's specifications. The boiler had a diameter of 39 in (991 mm) and was 9 ft (2,743 mm) long. Both locomotives became only really useful after modifications in the years 1839 till 1840 they had been rebuilt with 13 in × 18 in (330 mm × 457 mm) and conventional drive. Most probably they received their 6 ft (1,829 mm) driving wheels at the same time. They were later converted to 2-2-2T tank locomotives,
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