Grace's Guide is the leading source of historical information on industry and manufacturing in Britain. This web publication contains 148,441 pages of information and 233,877 images on early companies, their products and the people who designed and built them.
William Kitching was a director of the Stockton and Darlington Railway from 1823.
1827 William Kitching, Ironmonger and Iron and Brass Founder of Market Place, Darlington 
1828 William Kitching of Tubwell Row, Darlington listed under Ironmongers and Jewellers. 
In 1831 involved with an incident with runaway wagons and then he is described as a man of massive dimensions weighing some 18 stone.
1841 William Kitching living at Tubwell Row, Darlington (age 40), an Ironfounder. No family listed. Nearby is a Richard Kitching (age 40) a Chemist. 
1850 Q3 William died
Timothy Hackworth and the Locomotive by Robert Young. Published 1923.