1875 1 July 35/2 Austin Chambers, signal engineer.
1951 Sept. 135/1 A New York subway motorman, told Bruce Coughlin, who is a signal engineer,..that there ought to be a ‘wigwag’..before a tunnel entrance near the Delaware Water Gap.
2010 (Nexis) 21 Oct. Hawks..is re-training to become a signal engineer with London Underground.