The person who operates a full-scale train (locomotive) is the engineer.
Other crew positions are the conductor (who is also the operator on a trolley or streetcar), the brakeman (safety and mechanical crewman), and the fireman (on old-style steam locomotives) who may be simply a stoker.
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In the UK he was and is always simply the Driver, assisted by the Fireman who was never called the 'stoker', on a steam-locomotive. ("He": & she now as there are women drivers now.) "Stoker" was used in the Royal and Merchant Navies for a ship's boiler-room crew-member.
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The person who operates a full-scale train (locomotive) is the engineer.
On urban or subway trains, he may be called the motorman.
Other crew positions are the conductor (who is also the operator on a trolley or streetcar), the brakeman (safety and mechanical crewman), and the fireman (on old-style steam locomotives) who may be simply a stoker.