Source : Webster's Revised Unabridged Dictionary (1913)

Locomotive \Lo"co*mo`tive\, n.
   A locomotive engine; a self-propelling wheel carriage,
   especially one which bears a steam boiler and one or more
   steam engines which communicate motion to the wheels and thus
   propel the carriage, -- used to convey goods or passengers,
   or to draw wagons, railroad cars, etc. See Illustration in
   Appendix.

   {Consolidation locomotive}, a locomotive having four pairs of
      connected drivers.

   {Locomotive car}, a locomotive and a car combined in one
      vehicle; a dummy engine. [U.S.]

   {Locomotive engine}. Same as {Locomotive}, above.

   {Mogul locomotive}. See {Mogul}.

Source : WordNet®

locomotive engine
     n : a wheeled vehicle consisting of a self-propelled engine that
         is used to draw trains along railway tracks [syn: {locomotive},
          {engine}, {railway locomotive}]