1803- 1859 Only son of Stephenson, George. He was an engineer like his father. He helped his father survey the Stockton and Darlington railway. In 1819 he again joined his father, this time in forming the first company to build steam locomotives. In 1833 he became the chief engineer on the London and Birmingham line and was involved in building tunnels and cuttings, as well as being involved with the steam engines themselves. He was later responsible for several major bridges including those that crossed the Tyne at Newcastle and the Lesbury viaduct over the River Aln.