engineman

noun3

1. •
   A navy sailor who operates, manages, and maintains engines and various other shipboard equipment (such as one with the United States Navy EN occupational rating).
2. •
   (old-fashioned) A man who operates, manages, and maintains an engine.

   • The engineman having only to turn two cocks, so as to connect the steam with the one or the other vessel." — 1879
3. •
   (old-fashioned) A locomotive engineer; (sometimes) any footplateman.

   • At one corner of the room three enginemen were lost in serious discussion; in other corners, mécaniciens and chauffeurs were quietly talking, playing draughts, reading or eating. — 1961