title: GWR Haigh Foundry locomotives
text: # GWR Haigh Foundry locomotives
  
  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, possibly when they were sent to work the South Devon Railway in 1846, where they got the names Exe and Teign. The locomotives returned 1851. Snake operated till November 1869, Viper till January 1868. The boiler of Viper was afterwards used as stationary boiler in Shrewsbury.
  
  ## Names
  
  * Snake (Haigh Foundry 25; 1838–1869)
  
      Between 1846 and 1851 it carried a different name, Exe, while working on the South Devon Railway, after the River Exe; it reverted to Snake when it returned to the Great Western Railway.
  * Viper (Haigh Foundry 26; 1838–1868)
  
      Between 1846 and 1851 it carried a different name, Teign, while working on the South Devon Railway, after the River Teign; it reverted to Viper when it returned to the Great Western Railway.
  