Keith Archibald Smith, OBE, AM, MIE Aust, FCIT, (4 May 1915 – 16 July 2011) was Chief Mechanical Engineer, and later Commissioner, for the Commonwealth Railways of Australia, which operates mostly in remote and desolate areas railways for the Federal Government.Before joining the Commonwealth Railways, Keith Smith graduated with honours from Sydney University and was a locomotive designing and test engineer with the New South Wales Government Railways.