Source : Webster's Revised Unabridged Dictionary (1913)

Brakeman \Brake"man\, n.; pl. {Brakemen}.
   1. (Railroads) A man in charge of a brake or brakes.

   2. (Mining) The man in charge of the winding (or hoisting)
      engine for a mine.

Source : WordNet®

brakeman
     n : a railroad employee responsible for a train's brakes