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Thomas Richardson and Sons of Castle Eden Foundry, Hartlepool, County Durham were builders of locomotives, mining equipment and shipbuilders.
1840 First steam locomotives built.
1844 Thomas Richardson briefly returned to shipbuilding, building two vessels in Hartlepool over the next two years, but his main interest from then was building engines.
1847 The business became T. Richardson and Sons.
It was the engines side of the business which was developing when his sons took over the firm upon Thomas' death in 1850.
1851 First marine engine built; during the following ten years the marine engineering branch increased rapidly.
1851 Supplied vertical single-cylinder 300 hp winding engine for South Hetton Colliery.
1855 The name of the related shipbuilding firm was changed to Richardson Brothers.
1857 50 locomotives built by this date but the company now focused on colliery and marine engines.
1857 The shipbuilding business of the Richardson Brothers was forced to close due to money problems. They concentrated on the other business, which was making engines for ships (marine engines).
By 1861 marine engineering had become the chief area of manufacturing
1868 Thomas Richardson (1846-1906) joined the firm.
1868 Description and illustrations of engines for West Indian mail steamer 'Columbian', designed by George W. Jaffrey. 
1873(?) One of their employees was Thomas Mudd, a brilliant engineer. He worked for Richardsons for ten years.
1894 Morison's Evaporator. Article and illustration in 'The Engineer'.
1900 Amalgamation of three companies: T. Richardson and Sons of Hartlepool; Sir Christopher Furness, Westgarth and Co of Middlesbrough and William Allan and Co of Scotia Engine works, Sunderland to form the new company Richardsons, Westgarth and Co.