The Collaborative International Dictionary of English v.0.48:

Engine \En"gine\ ([e^]n"j[i^]n), n. [F. engin skill, machine,
   engine, L. ingenium natural capacity, invention; in in + the
   root of gignere to produce. See Genius, and cf.
   Ingenious, Gin a snare.]
   1.

   Note: (Pronounced, in this sense, [e^]n*j[=e]n".) Natural
         capacity; ability; skill. [Obs.]
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               A man hath sapiences three,
               Memory, engine, and intellect also. --Chaucer.
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   2. Anything used to effect a purpose; any device or
      contrivance; a machine; an agent. --Shak.
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            You see the ways the fisherman doth take
            To catch the fish; what engines doth he make?
                                                  --Bunyan.
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            Their promises, enticements, oaths, tokens, and all
            these engines of lust.                --Shak.
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   3. Any instrument by which any effect is produced;
      especially, an instrument or machine of war or torture.
      "Terrible engines of death." --Sir W. Raleigh.
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   4. (Mach.) A compound machine by which any physical power is
      applied to produce a given physical effect.
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   Engine driver, one who manages an engine; specifically, the
      engineer of a locomotive.

   Engine lathe. (Mach.) See under Lathe.

   Engine tool, a machine tool. --J. Whitworth.

   Engine turning (Fine Arts), a method of ornamentation by
      means of a rose engine.
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   Note: The term engine is more commonly applied to massive
         machines, or to those giving power, or which produce
         some difficult result. Engines, as motors, are
         distinguished according to the source of power, as
         steam engine, air engine, electro-magnetic engine; or
         the purpose on account of which the power is applied,
         as fire engine, pumping engine, locomotive engine; or
         some peculiarity of construction or operation, as
         single-acting or double-acting engine, high-pressure or
         low-pressure engine, condensing engine, etc.
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WordNet (r) 3.0 (2006):

engine driver
    n 1: the operator of a railway locomotive [syn: engineer,
         locomotive engineer, railroad engineer, engine
         driver]