A man whose business is to extinguish fires in towns; a member of a fire company
The crew member whose job it is to keep the fire and steam up in a steam locomotive, and who is responsible for the operating condition of power units on diesel and electric engines
An unlicensed member of the engine, room staff whose duties consist in standing watch in the boiler room and insuring the oil burning equipment is working properly
By extension of the above, an assistant on any locomotive, whether steam-powered or not