Early years He was apprenticed to a shipbuilder and later worked for
Robert Stephenson, the
Grand Junction Railway and the
Paris and Rouen Railway.
Consulting engineer Sinclair resigned from the GER 1865, and became a consulting engineer. In this capacity, he designed a fast
2-4-2 locomotive for the Great Luxemburg Railway, and an outside cylinder
2-4-0 for the
East Indian Railway. The Luxembourg 2-4-2 design was later adapted into a 2-4-2T for commuter services on the GER. ==Locomotive designs==