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Saxby and Farmer of Kilburn and later of Chippenham were railway signal manufacturers.
1861 John Saxby gained a patent on interlocking signals and crossings.
The works were moved to Kilburn
Late 1860s was selling frames to Continental railways
1878 Set up works at Creil in France
1893 Incorporated as a limited company.
1903 Acquired Evans, O'Donnell and Co of Chippenham; the works were moved from Kilburn, London, to Chippenham. Mr Charles Hodgson, Mr A. G. Evans and Mr J. P. O' Donnell are joint managing directors. Mr Charles Hodgson was also appointed chairman.
1905 Set up works at Calcutta
1914 Railway signalling engineers. Specialities: union of lock and block systems, facing point locks and other safety appliances. Employees 800 permanent, up to 1,000 contracted as work necessitates. 
1920 Absorbed into Westinghouse Brake Co.
1921 The Saxby and Farmer Interlocking Frame was in use all over the world.