Definition of engineman in US English:

engineman

noun

  • 1A person (especially a man) who operates, or assists with the operation of, a fire engine. Now US.

  • 2A person (especially a man) who operates or attends to a stationary engine (especially a steam engine) in a factory, mine, etc. Now rare (chiefly historical).

  • 3The operator of a locomotive engine; a train driver.

Origin

Early 18th century; earliest use found in Boston Selectman. From engine + man.