Portal:London transport/Selected biographies/5

James Henry Greathead (6 August 1844 - 21 October 1896) was a civil engineer known for his pioneering development of tunnelling techniques and for his work on London's underground railways. In 1869, working under Peter W. Barlow, he became engineer in charge of driving the tunnel of the Tower Subway under the River Thames using a tunnelling shield he designed based on Barlow's own slightly earlier patented design.

Greathead developed and patented a number of improvements to the Barlow shield and the improved design carried their joint names. Greathead also developed the use of a segmented cast iron lining for the circular tunnel, erected in sections from which the shield was jacked forward. Greathead was then involved in the planning and construction of a number of railways in Britain and Ireland, until, in 1884, he was appointed engineer for the City and South London Railway, the world's first underground electric railway when it opened in 1890. Greathead subsequently worked on the Waterloo and City Railway, the Liverpool Overhead Railway and the early planning of the Central London Railway. (Full article...)